1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tekilochka [14]
4 years ago
5

Simplify and solve for x. ​ ​ 5(x+20)= 7x+30

Mathematics
2 answers:
hodyreva [135]4 years ago
6 0

Answer:

x = 35

Step-by-step explanation:

Solve for x:

5 (x + 20) = 7 x + 30

Expand out terms of the left hand side:

5 x + 100 = 7 x + 30

Subtract 7 x from both sides:

(5 x - 7 x) + 100 = (7 x - 7 x) + 30

5 x - 7 x = -2 x:

-2 x + 100 = (7 x - 7 x) + 30

7 x - 7 x = 0:

100 - 2 x = 30

Subtract 100 from both sides:

(100 - 100) - 2 x = 30 - 100

100 - 100 = 0:

-2 x = 30 - 100

30 - 100 = -70:

-2 x = -70

Divide both sides of -2 x = -70 by -2:

(-2 x)/(-2) = (-70)/(-2)

(-2)/(-2) = 1:

x = (-70)/(-2)

The gcd of -70 and -2 is -2, so (-70)/(-2) = (-2×35)/(-2×1) = (-2)/(-2)×35 = 35:

Answer: x = 35

valkas [14]4 years ago
4 0

Answer:

x =  35

Step-by-step explanation:

5(x+20)= 7x+30

5x + 100 = 7x + 30

-30                   -30

5x + 70 = 7x

-5x          -5x

70 = 2x

/2      /2

35 = x

You might be interested in
Solve using substitution. -2x - 2y = -14 <br>3x + 4y = 19​
hoa [83]

Answer:

69

Step-by-step explanation:

hsvsvvssjzvsvs

jsjdvduzhs

kebab D x

handbags z

jjsbdbdb

usgsvsv

ywbsbs

hdhfvd

usgdvd

iesvdv

3 0
3 years ago
Setting 7/3 equal to which ratio would result in a valid proportion?
MakcuM [25]
It is b im late buh w.e
4 0
4 years ago
Read 2 more answers
What’s 2x4+10-17•2067
AlekseyPX
The correct answer is 2067
7 0
3 years ago
Read 2 more answers
How do you evaluate the function f(x)=x+6 when x = -2,0 &amp; 5? (step by step please!)
blagie [28]

Answer:

f(-2) = 4

f(0) = 6

f(5) = 11

Step-by-step explanation:

f(x)=x+6 when x = -2

Substitute x=-2

f(-2) = -2+6

f(-2) = 4

f(x)=x+6 when x = 0

Substitute x=0

f(0) = 0+6

f(0) = 6

f(x)=x+6 when x = 5

Substitute x=5

f(5) = 5+6

f(5) = 11

3 0
3 years ago
HELLLLLP PLEASE I NEED SOME HELP I BEEN STRUGGLING IN MATH WITH MARKUP TAX AND DISCOUNT
Neporo4naja [7]
Its simple really. If say a person bought a sandwich for $5.00, and the tax was 7%. You would have to multiply the amount of the sandwich to 0.07. Doing this would tell you how much the tax is. Then you would simply add them to get your total. This also applies with tip, markup, and discount. 
5 0
4 years ago
Other questions:
  • What is 400 turned into a decimal??
    12·1 answer
  • 1. what is 20 percent of 12.37
    8·1 answer
  • Complete the table. then describe a pattern in the decimal forms o the fractions.
    7·1 answer
  • Without graphing estimate the x-intercepts of the graph of f(x)=7x^2+9x+1 to the nearest tenth.
    14·1 answer
  • Barbie is analyzing a circle, y2 + x2 = 16, and a linear function g(x). Will they intersect?
    10·1 answer
  • Sally bought 4 lemons and gave two to her brother how many Lemons does sally have now?
    10·2 answers
  • The correct answer (reported to the proper number of significant figures) to the following is:(1712 - 1615) × (8.66 × 7.66) = __
    15·1 answer
  • Convert 0.125 to fraction with ex
    8·2 answers
  • Someone come in clutch rn
    11·1 answer
  • Use the distributive property to simplify 5(w + 6) =
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!