91=10r+3r

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Solution for 91=10r+3r equation: 



91=10r+3r

We move all terms to the left:

91-(10r+3r)=0

We add all the numbers together, and all the variables

-(+13r)+91=0

We get rid of parentheses

-13r+91=0

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

-13r=-91

r=-91/-13

r=+7

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