56=21+5u

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Solution for 56=21+5u equation: 



56=21+5u

We move all terms to the left:

56-(21+5u)=0

We add all the numbers together, and all the variables

-(5u+21)+56=0

We get rid of parentheses

-5u-21+56=0

We add all the numbers together, and all the variables

-5u+35=0

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

-5u=-35

u=-35/-5

u=+7

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