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10w=81+w
We move all terms to the left:
10w-(81+w)=0
We add all the numbers together, and all the variables
10w-(w+81)=0
We get rid of parentheses
10w-w-81=0
We add all the numbers together, and all the variables
9w-81=0
We move all terms containing w to the left, all other terms to the right
9w=81
w=81/9
w=9
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