9r+5r+8-2=90

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Solution for 9r+5r+8-2=90 equation: 



9r+5r+8-2=90

We move all terms to the left:

9r+5r+8-2-(90)=0

We add all the numbers together, and all the variables

14r-84=0

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

14r=84

r=84/14

r=6

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