91=7-7(-1+5r)

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Solution for 91=7-7(-1+5r) equation: 



91=7-7(-1+5r)

We move all terms to the left:

91-(7-7(-1+5r))=0

We add all the numbers together, and all the variables

-(7-7(5r-1))+91=0



We calculate terms in parentheses: -(7-7(5r-1)), so:

7-7(5r-1)

determiningTheFunctionDomain
-7(5r-1)+7

We multiply parentheses

-35r+7+7

We add all the numbers together, and all the variables

-35r+14

Back to the equation:

-(-35r+14)



We get rid of parentheses

35r-14+91=0

We add all the numbers together, and all the variables

35r+77=0

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

35r=-77

r=-77/35

r=-2+1/5

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