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12+x/2=15
We move all terms to the left:
12+x/2-(15)=0
We add all the numbers together, and all the variables
x/2-3=0
We multiply all the terms by the denominator
x-3*2=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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