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13+31=w-42
We move all terms to the left:
13+31-(w-42)=0
We add all the numbers together, and all the variables
-(w-42)+44=0
We get rid of parentheses
-w+42+44=0
We add all the numbers together, and all the variables
-1w+86=0
We move all terms containing w to the left, all other terms to the right
-w=-86
w=-86/-1
w=+86
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