4x-1+3=4x

My answer is -5

4x-1+3x=4x
3x+4x
8x-1 = 4x-8
-1 = -4x
-1-4 = x
-5 = x

Am I correct

Substitute -5 for x.

-20 + 2 = -20

Nope that doesn't work.

Subtract 4x from both sides of the equation. There is no solution.