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-8x-15=-7x+12
We move all terms to the left:
-8x-15-(-7x+12)=0
We get rid of parentheses
-8x+7x-12-15=0
We add all the numbers together, and all the variables
-1x-27=0
We move all terms containing x to the left, all other terms to the right
-x=27
x=27/-1
x=-27
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