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85=42x-83
We move all terms to the left:
85-(42x-83)=0
We get rid of parentheses
-42x+83+85=0
We add all the numbers together, and all the variables
-42x+168=0
We move all terms containing x to the left, all other terms to the right
-42x=-168
x=-168/-42
x=+4
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