91=2r+7

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Solution for 91=2r+7 equation: 



91=2r+7

We move all terms to the left:

91-(2r+7)=0

We get rid of parentheses

-2r-7+91=0

We add all the numbers together, and all the variables

-2r+84=0

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

-2r=-84

r=-84/-2

r=+42

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