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-12+x/2=-3
We move all terms to the left:
-12+x/2-(-3)=0
We add all the numbers together, and all the variables
x/2-9=0
We multiply all the terms by the denominator
x-9*2=0
We add all the numbers together, and all the variables
x-18=0
We move all terms containing x to the left, all other terms to the right
x=18
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