20=13w-9w

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Solution for 20=13w-9w equation: 



20=13w-9w

We move all terms to the left:

20-(13w-9w)=0

We add all the numbers together, and all the variables

-(+4w)+20=0

We get rid of parentheses

-4w+20=0

We move all terms containing w to the left, all other terms to the right

-4w=-20

w=-20/-4

w=+5

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