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-85=-4+x
We move all terms to the left:
-85-(-4+x)=0
We add all the numbers together, and all the variables
-(x-4)-85=0
We get rid of parentheses
-x+4-85=0
We add all the numbers together, and all the variables
-1x-81=0
We move all terms containing x to the left, all other terms to the right
-x=81
x=81/-1
x=-81
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