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8w+7(w-4)=2
We move all terms to the left:
8w+7(w-4)-(2)=0
We multiply parentheses
8w+7w-28-2=0
We add all the numbers together, and all the variables
15w-30=0
We move all terms containing w to the left, all other terms to the right
15w=30
w=30/15
w=2
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