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12=13w-7w
We move all terms to the left:
12-(13w-7w)=0
We add all the numbers together, and all the variables
-(+6w)+12=0
We get rid of parentheses
-6w+12=0
We move all terms containing w to the left, all other terms to the right
-6w=-12
w=-12/-6
w=+2
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