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15+12.5x=39
We move all terms to the left:
15+12.5x-(39)=0
We add all the numbers together, and all the variables
12.5x-24=0
We move all terms containing x to the left, all other terms to the right
12.5x=24
x=24/12.5
x=1+7.66666666667/8.33333333333
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