R(r-2)+9(r-2)=0

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Solution for R(r-2)+9(r-2)=0 equation: 



(R-2)+9(R-2)=0

We multiply parentheses

(R-2)+9R-18=0

We get rid of parentheses

R+9R-2-18=0

We add all the numbers together, and all the variables

10R-20=0

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

10R=20

R=20/10

R=2

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