21=7u+7(u-7)

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Solution for 21=7u+7(u-7) equation: 



21=7u+7(u-7)

We move all terms to the left:

21-(7u+7(u-7))=0



We calculate terms in parentheses: -(7u+7(u-7)), so:

7u+7(u-7)

We multiply parentheses

7u+7u-49

We add all the numbers together, and all the variables

14u-49

Back to the equation:

-(14u-49)



We get rid of parentheses

-14u+49+21=0

We add all the numbers together, and all the variables

-14u+70=0

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

-14u=-70

u=-70/-14

u=+5

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