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-15x-135=2x+171
We move all terms to the left:
-15x-135-(2x+171)=0
We get rid of parentheses
-15x-2x-171-135=0
We add all the numbers together, and all the variables
-17x-306=0
We move all terms containing x to the left, all other terms to the right
-17x=306
x=306/-17
x=-18
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