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-15+4x=12+15x
We move all terms to the left:
-15+4x-(12+15x)=0
We add all the numbers together, and all the variables
4x-(15x+12)-15=0
We get rid of parentheses
4x-15x-12-15=0
We add all the numbers together, and all the variables
-11x-27=0
We move all terms containing x to the left, all other terms to the right
-11x=27
x=27/-11
x=-2+5/11
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