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157=83-x
We move all terms to the left:
157-(83-x)=0
We add all the numbers together, and all the variables
-(-1x+83)+157=0
We get rid of parentheses
1x-83+157=0
We add all the numbers together, and all the variables
x+74=0
We move all terms containing x to the left, all other terms to the right
x=-74
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