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257=88-x
We move all terms to the left:
257-(88-x)=0
We add all the numbers together, and all the variables
-(-1x+88)+257=0
We get rid of parentheses
1x-88+257=0
We add all the numbers together, and all the variables
x+169=0
We move all terms containing x to the left, all other terms to the right
x=-169
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