Question

Is 7 a solution of the equation 3x + 8 - x = 5x - 4?

Answer 1

No, but x = 4

Explanation:

3(7) + 8 - 7 = 5(7) - 4

21 + 8 - 7 = 22

22 = 35 - 4

22 = 31

It is not

How this equation may work is by subtracting the numbers by each side

3x + 8 - x = 2x + 8

2x + 8 = 5x - 4

-8 -8

2x = 5x - 12

-5x -5x

-3x = -12

x = 4