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Nitella [24]
4 years ago
9

Help me solve this equation 3x-7=4x

Mathematics
2 answers:
Alla [95]4 years ago
7 0
3x - 7 = 4x

We're basically just trying to take all of the variables & put it onto one side, and then move everything else to the other side :)

So, we must add 7 to both sides.

3x = 4x + 7

Then, we subtract 4x from both sides.

3x - 4x = 7

Simplify.

-x = 7

Divide both sides by -1.

x = -7

To check our work, we simply need to plug in -7 for x in our given equation :)

3x - 7 = 4x

3(-7) - 7 = 4(-7)

Simplify.

-21 - 7 = -28

-28 = -28

Therefore, x = -7

~Hope I helped!~
Sauron [17]4 years ago
4 0
Hey!

Let's write it, 3x-7=4x
Add 7 to both sides,
3x-7+7=4x+7
3x=4x+7
Subtract 4x from both sides.
3x-4x=4x+7-4x
-x=7
Since we don't want a negative variable, we have to divide both sides by -1.
\frac{-x}{-1}=\frac{7}{-1}
Our answer would be,
x=-7

Thanks!
-TetraFish
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If 8 ounces of a sports drink contain 110 milligrams of sodium what is the total number of milligrams of sodium in 20 ounces of
Sati [7]
The milligrams of sodium in a 20 ounce sports drink is 275 milligrams.
Work:
I divided 110 by 8 which gave me 13.75
13.75 is the milligrams of sodium in each ounce.
I then divided it by 20 and got 275 the number of milligrams in a 20 ounce drink.
7 0
3 years ago
Please help me with the whole page. I need the answers and calculations please!
Harman [31]
4: (3/4 - 1/2) X 3/5. 

You need them all to have the same denominator (bottom number) 
The lowest common denominator (LCM) of 2,4 and 5 is 20
4 X 5 = 20
2 X 10 = 20
5 X 4 = 20 

Then multiply the top number by the amount you need to multiply the bottom number by to get 20

3 X 5 = 15
1 X 10 = 10
3 X 4 = 12

(3/4 - 1/2) X 3/5. Turns to (15/20 - 10/20) X 12/20.

15 - 10  = 5
5 X 12 = 60

Answer: 60/20
Simplified: Either 3 or 3/1.



If you use the steps above then you should be able to do the rest :D
If you need anymore help, please ask
3 0
3 years ago
The solution to x2 – 10x = 24 is
Marat540 [252]

Answer:

x = - 2, x = 12

Step-by-step explanation:

Given

x² - 10 x  = 24 ( subtract 24 from both sides )

x² - 10x - 24 = 0 ← in standard form

To factorise the quadratic

Consider the factors of the constant term (- 24) which sum to give the coefficient of the x- term (- 10)

The factors are - 12 and + 2, since

- 12 × 2 = - 24 and - 12 + 2 = - 10, thus

(x - 12)(x + 2) = 0

Equate each factor to zero and solve for x

x - 12 = 0 ⇒ x = 12

x + 2 = 0 ⇒ x = - 2

8 0
3 years ago
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Lesechka [4]

9514 1404 393

Answer:

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To eliminate x, multiply the first equation by 3 and add 2 times the second equation.

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  -6x +21y +6x -8y = 51 -38

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5 0
3 years ago
What is 2x3xnxn=54 what is n?
Doss [256]
It would be
2x3xnxn
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