Answer:
-21 (probably)
Step-by-step explanation:
I will assume you mean (2x+7) in the question, but you can use these same steps if that's incorrect
We can multiply each side to get values that are easier to work with
could be reversed ↓ ↓ (see above)
2x^2 - 8x = 2x^2 - 18x + 7x - 63
now we can take like terms from each side to simplify
-8x = - 18x + 7x - 63
0 = - 10x + 7x - 63
0 = -3x - 63
now we get x by itself
3x = -63
x = -63/3
x = -21
The answer will be different if you meant (2x-7) in the question