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4w+12=8w-4
We move all terms to the left:
4w+12-(8w-4)=0
We get rid of parentheses
4w-8w+4+12=0
We add all the numbers together, and all the variables
-4w+16=0
We move all terms containing w to the left, all other terms to the right
-4w=-16
w=-16/-4
w=+4
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