10=21+7u

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Solution for 10=21+7u equation: 



10=21+7u

We move all terms to the left:

10-(21+7u)=0

We add all the numbers together, and all the variables

-(7u+21)+10=0

We get rid of parentheses

-7u-21+10=0

We add all the numbers together, and all the variables

-7u-11=0

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

-7u=11

u=11/-7

u=-1+4/7

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