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2x=-x+171
We move all terms to the left:
2x-(-x+171)=0
We add all the numbers together, and all the variables
2x-(-1x+171)=0
We get rid of parentheses
2x+1x-171=0
We add all the numbers together, and all the variables
3x-171=0
We move all terms containing x to the left, all other terms to the right
3x=171
x=171/3
x=57
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