20=13u-9u

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Solution for 20=13u-9u equation: 



20=13u-9u

We move all terms to the left:

20-(13u-9u)=0

We add all the numbers together, and all the variables

-(+4u)+20=0

We get rid of parentheses

-4u+20=0

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

-4u=-20

u=-20/-4

u=+5

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