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4w=81-4w
We move all terms to the left:
4w-(81-4w)=0
We add all the numbers together, and all the variables
4w-(-4w+81)=0
We get rid of parentheses
4w+4w-81=0
We add all the numbers together, and all the variables
8w-81=0
We move all terms containing w to the left, all other terms to the right
8w=81
w=81/8
w=10+1/8
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