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(x+12)*2=x+39
We move all terms to the left:
(x+12)*2-(x+39)=0
We multiply parentheses
2x-(x+39)+24=0
We get rid of parentheses
2x-x-39+24=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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