21=16u-9u

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Solution for 21=16u-9u equation: 



21=16u-9u

We move all terms to the left:

21-(16u-9u)=0

We add all the numbers together, and all the variables

-(+7u)+21=0

We get rid of parentheses

-7u+21=0

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

-7u=-21

u=-21/-7

u=+3

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