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x/2+18=39
We move all terms to the left:
x/2+18-(39)=0
We add all the numbers together, and all the variables
x/2-21=0
We multiply all the terms by the denominator
x-21*2=0
We add all the numbers together, and all the variables
x-42=0
We move all terms containing x to the left, all other terms to the right
x=42
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