R-9=1+2r

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Solution for R-9=1+2r equation: 



-9=1+2R

We move all terms to the left:

-9-(1+2R)=0

We add all the numbers together, and all the variables

-(2R+1)-9=0

We get rid of parentheses

-2R-1-9=0

We add all the numbers together, and all the variables

-2R-10=0

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

-2R=10

R=10/-2

R=-5

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