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108-8x=-15x-81
We move all terms to the left:
108-8x-(-15x-81)=0
We get rid of parentheses
-8x+15x+81+108=0
We add all the numbers together, and all the variables
7x+189=0
We move all terms containing x to the left, all other terms to the right
7x=-189
x=-189/7
x=-27
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