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156=-x+57
We move all terms to the left:
156-(-x+57)=0
We add all the numbers together, and all the variables
-(-1x+57)+156=0
We get rid of parentheses
1x-57+156=0
We add all the numbers together, and all the variables
x+99=0
We move all terms containing x to the left, all other terms to the right
x=-99
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