91=-7(1-2r)

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Solution for 91=-7(1-2r) equation: 



91=-7(1-2r)

We move all terms to the left:

91-(-7(1-2r))=0

We add all the numbers together, and all the variables

-(-7(-2r+1))+91=0



We calculate terms in parentheses: -(-7(-2r+1)), so:

-7(-2r+1)

We multiply parentheses

14r-7

Back to the equation:

-(14r-7)



We get rid of parentheses

-14r+7+91=0

We add all the numbers together, and all the variables

-14r+98=0

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

-14r=-98

r=-98/-14

r=+7

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