(5r+5)+(8r-6)=90

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Solution for (5r+5)+(8r-6)=90 equation: 



(5r+5)+(8r-6)=90

We move all terms to the left:

(5r+5)+(8r-6)-(90)=0

We get rid of parentheses

5r+8r+5-6-90=0

We add all the numbers together, and all the variables

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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