91=7(r+10)

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Solution for 91=7(r+10) equation: 



91=7(r+10)

We move all terms to the left:

91-(7(r+10))=0



We calculate terms in parentheses: -(7(r+10)), so:

7(r+10)

We multiply parentheses

7r+70

Back to the equation:

-(7r+70)



We get rid of parentheses

-7r-70+91=0

We add all the numbers together, and all the variables

-7r+21=0

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

-7r=-21

r=-21/-7

r=+3

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