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12x=x+39.5
We move all terms to the left:
12x-(x+39.5)=0
We get rid of parentheses
12x-x-39.5=0
We add all the numbers together, and all the variables
11x-39.5=0
We move all terms containing x to the left, all other terms to the right
11x=39.5
x=39.5/11
x=3+4.3333333333333/7.3333333333333
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