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39+8x=-12x+15
We move all terms to the left:
39+8x-(-12x+15)=0
We get rid of parentheses
8x+12x-15+39=0
We add all the numbers together, and all the variables
20x+24=0
We move all terms containing x to the left, all other terms to the right
20x=-24
x=-24/20
x=-1+1/5
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