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12-7w=-11w
We move all terms to the left:
12-7w-(-11w)=0
We get rid of parentheses
-7w+11w+12=0
We add all the numbers together, and all the variables
4w+12=0
We move all terms containing w to the left, all other terms to the right
4w=-12
w=-12/4
w=-3
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