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nata0808 [166]
3 years ago
10

Seven less than a number is 14 more than 2 times that number. What is the number?

Mathematics
1 answer:
ratelena [41]3 years ago
4 0

Answer:

x=-21

Step-by-step explanation:

x-7=2x+14

-7=x+14

-21=x

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Please help it will be brainlist please make sure you are 100% the awnser is right
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Answer:

Step-by-step explanation:

Step 1: Sum of angles on a straight line is 180

Step 2:

2x + 25 + y = 180

2x + y = 180 - 25

2x + y = 155  (1)

Step 3:

3x - 10 + y = 180

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Step 4: Substract equation 1 from 2

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Step 5:

Substitute x in equation 1 to find y

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4 0
3 years ago
What are the solutions?<br>8x^2-12x-23=-5​
erastova [34]

Answer:

x = 3/4 + (3 sqrt(5))/4 or x = 3/4 - (3 sqrt(5))/4

Step-by-step explanation:

Solve for x over the real numbers:

8 x^2 - 12 x - 23 = -5

Divide both sides by 8:

x^2 - (3 x)/2 - 23/8 = -5/8

Add 23/8 to both sides:

x^2 - (3 x)/2 = 9/4

Add 9/16 to both sides:

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Write the left hand side as a square:

(x - 3/4)^2 = 45/16

Take the square root of both sides:

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Add 3/4 to both sides:

x = 3/4 + (3 sqrt(5))/4 or x - 3/4 = -(3 sqrt(5))/4

Add 3/4 to both sides:

Answer:  x = 3/4 + (3 sqrt(5))/4 or x = 3/4 - (3 sqrt(5))/4

4 0
3 years ago
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