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157=66-x
We move all terms to the left:
157-(66-x)=0
We add all the numbers together, and all the variables
-(-1x+66)+157=0
We get rid of parentheses
1x-66+157=0
We add all the numbers together, and all the variables
x+91=0
We move all terms containing x to the left, all other terms to the right
x=-91
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