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157=90+x
We move all terms to the left:
157-(90+x)=0
We add all the numbers together, and all the variables
-(x+90)+157=0
We get rid of parentheses
-x-90+157=0
We add all the numbers together, and all the variables
-1x+67=0
We move all terms containing x to the left, all other terms to the right
-x=-67
x=-67/-1
x=+67
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