Question

Find the error.
3x-4=7x+12
4x-4=12
4x=16
x=4

Answer 1

The 4 shouldn’t be a negative

Answer 2

Explanation:

Subtracting 7x from 3x should give -4x, not 4x, so the answer should be:

`- 4x - 4 = 12`

`- 4x = 16`

`x = - 4`