8x - 2 = -9 + 7x
Add 2 to both sides to eliminate it: 8x = -7 + 7x
Subtract 7x from both side to eliminate it. x = -7
Since x = -7, we can substitute x in 4x - 4 for -7.
Like this: 4(-7) - 4
Now simplify and solve:
-28 - 4
-32
The value of 4x - 4 is 32, since x = -7
