Answer:
x = 8
x = 10
Step-by-step explanation:
lx -9l + 7 = 8
lx - 9l + 7 - 7 = 8 - 7
lx - 9l = 1
Split into a positive and a negative case.
x - 9 = 1 and - (x - 9) = 1
Add nine to both sides
x - 9 + 9 = 1 + 9
x = 10
- (x - 9) = 1
Subtract 9 from both sides
- 8 = - x
Multiply both sides by negative 1
x = 8
