answer: x = 24
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1/8x+12=x-9
1. multiply both sides of the equation by 8
x + 96 = 8x - 72
2. Move variable to the left side and change its sign
x - 8x + 96 = -72
3. Move constant to the right side and change its sign
x - 8x = -72 - 96
4. Collect the like terms
-7x = -72 - 96
5. Calculate the difference
-7x = -168
6. Divide both sides of the equation by -7
x = 24
SOLUTION:
x = 24
