81=13w-4w

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Solution for 81=13w-4w equation: 



81=13w-4w

We move all terms to the left:

81-(13w-4w)=0

We add all the numbers together, and all the variables

-(+9w)+81=0

We get rid of parentheses

-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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