(5r+7)+(7r-1)=90

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Solution for (5r+7)+(7r-1)=90 equation: 



(5r+7)+(7r-1)=90

We move all terms to the left:

(5r+7)+(7r-1)-(90)=0

We get rid of parentheses

5r+7r+7-1-90=0

We add all the numbers together, and all the variables

12r-84=0

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

12r=84

r=84/12

r=7

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