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12-x/8=-3
We move all terms to the left:
12-x/8-(-3)=0
We add all the numbers together, and all the variables
-x/8+15=0
We multiply all the terms by the denominator
-x+15*8=0
We add all the numbers together, and all the variables
-1x+120=0
We move all terms containing x to the left, all other terms to the right
-x=-120
x=-120/-1
x=+120
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