84=7(u+9)

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Solution for 84=7(u+9) equation: 



84=7(u+9)

We move all terms to the left:

84-(7(u+9))=0



We calculate terms in parentheses: -(7(u+9)), so:

7(u+9)

We multiply parentheses

7u+63

Back to the equation:

-(7u+63)



We get rid of parentheses

-7u-63+84=0

We add all the numbers together, and all the variables

-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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