91=7(u+3)

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Solution for 91=7(u+3) equation: 



91=7(u+3)

We move all terms to the left:

91-(7(u+3))=0



We calculate terms in parentheses: -(7(u+3)), so:

7(u+3)

We multiply parentheses

7u+21

Back to the equation:

-(7u+21)



We get rid of parentheses

-7u-21+91=0

We add all the numbers together, and all the variables

-7u+70=0

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

-7u=-70

u=-70/-7

u=+10

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