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171=1-x
We move all terms to the left:
171-(1-x)=0
We add all the numbers together, and all the variables
-(-1x+1)+171=0
We get rid of parentheses
1x-1+171=0
We add all the numbers together, and all the variables
x+170=0
We move all terms containing x to the left, all other terms to the right
x=-170
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