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-6x-81=8x+171
We move all terms to the left:
-6x-81-(8x+171)=0
We get rid of parentheses
-6x-8x-171-81=0
We add all the numbers together, and all the variables
-14x-252=0
We move all terms containing x to the left, all other terms to the right
-14x=252
x=252/-14
x=-18
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