-91=7r+7(3r+7)

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



-91=7r+7(3r+7)

We move all terms to the left:

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



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

7r+7(3r+7)

We multiply parentheses

7r+21r+49

We add all the numbers together, and all the variables

28r+49

Back to the equation:

-(28r+49)



We get rid of parentheses

-28r-49-91=0

We add all the numbers together, and all the variables

-28r-140=0

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

-28r=140

r=140/-28

r=-5

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