(2r+8)+(8r-8)=90

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Solution for (2r+8)+(8r-8)=90 equation: 



(2r+8)+(8r-8)=90

We move all terms to the left:

(2r+8)+(8r-8)-(90)=0

We get rid of parentheses

2r+8r+8-8-90=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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