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15=x/2-12
We move all terms to the left:
15-(x/2-12)=0
We get rid of parentheses
-x/2+12+15=0
We multiply all the terms by the denominator
-x+12*2+15*2=0
We add all the numbers together, and all the variables
-1x+54=0
We move all terms containing x to the left, all other terms to the right
-x=-54
x=-54/-1
x=+54
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