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8w-12=-4w=
We move all terms to the left:
8w-12-(-4w)=0
We get rid of parentheses
8w+4w-12=0
We add all the numbers together, and all the variables
12w-12=0
We move all terms containing w to the left, all other terms to the right
12w=12
w=12/12
w=1
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