21=17+u

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Solution for 21=17+u equation: 



21=17+u

We move all terms to the left:

21-(17+u)=0

We add all the numbers together, and all the variables

-(u+17)+21=0

We get rid of parentheses

-u-17+21=0

We add all the numbers together, and all the variables

-1u+4=0

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

-u=-4

u=-4/-1

u=+4

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