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-12+4x=15+5x
We move all terms to the left:
-12+4x-(15+5x)=0
We add all the numbers together, and all the variables
4x-(5x+15)-12=0
We get rid of parentheses
4x-5x-15-12=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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