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15+w+(-12)=15-12-
We move all terms to the left:
15+w+(-12)-(15-12-)=0
We add all the numbers together, and all the variables
w+15+(-12)-0=0
We add all the numbers together, and all the variables
w+3=0
We move all terms containing w to the left, all other terms to the right
w=-3
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