Answer:
It is true for all x.
Explanation:
3(x + 1) = 3x + 3
3x + 3 = 3x + 3
3x = 3x + 3 - 3
3x = 3x
0 = 0
It is true for all x. It means that it can be any solution for x since they would result the same.
If you choose x = -8
3 (-8 + 1) = 3(-8) + 3
-24 + 3 = -24 + 3
-21 = -21