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13w=4w+81
We move all terms to the left:
13w-(4w+81)=0
We get rid of parentheses
13w-4w-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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