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x-31=2x-85
We move all terms to the left:
x-31-(2x-85)=0
We get rid of parentheses
x-2x+85-31=0
We add all the numbers together, and all the variables
-1x+54=0
We move all terms containing x to the left, all other terms to the right
-x=-54
x=-54/-1
x=+54
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