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85=120+x
We move all terms to the left:
85-(120+x)=0
We add all the numbers together, and all the variables
-(x+120)+85=0
We get rid of parentheses
-x-120+85=0
We add all the numbers together, and all the variables
-1x-35=0
We move all terms containing x to the left, all other terms to the right
-x=35
x=35/-1
x=-35
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