-91=7(3r-1)

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Solution for -91=7(3r-1) equation: 



-91=7(3r-1)

We move all terms to the left:

-91-(7(3r-1))=0



We calculate terms in parentheses: -(7(3r-1)), so:

7(3r-1)

We multiply parentheses

21r-7

Back to the equation:

-(21r-7)



We get rid of parentheses

-21r+7-91=0

We add all the numbers together, and all the variables

-21r-84=0

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

-21r=84

r=84/-21

r=-4

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