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7(w-12)=13w+12
We move all terms to the left:
7(w-12)-(13w+12)=0
We multiply parentheses
7w-(13w+12)-84=0
We get rid of parentheses
7w-13w-12-84=0
We add all the numbers together, and all the variables
-6w-96=0
We move all terms containing w to the left, all other terms to the right
-6w=96
w=96/-6
w=-16
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