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4x-15=-8x-27
We move all terms to the left:
4x-15-(-8x-27)=0
We get rid of parentheses
4x+8x+27-15=0
We add all the numbers together, and all the variables
12x+12=0
We move all terms containing x to the left, all other terms to the right
12x=-12
x=-12/12
x=-1
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