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8x+12=-15x-111
We move all terms to the left:
8x+12-(-15x-111)=0
We get rid of parentheses
8x+15x+111+12=0
We add all the numbers together, and all the variables
23x+123=0
We move all terms containing x to the left, all other terms to the right
23x=-123
x=-123/23
x=-5+8/23
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