Answer:
x +
= 15
Explanation:
Given
3x +
- 4 = 2(x + 9) - (7 -
) ← distribute and simplify right side
3x +
- 4 = 2x + 18 - 7 +

3x +
- 4 = 2x + 11 +
( subtract 2x from both sides )
x +
- 4 = 11 +
( subtract
from both sides )
x +
- 4 = 11 ( add 4 to both sides )
x +
= 15