R-18=18-3r

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Solution for R-18=18-3r equation: 



-18=18-3R

We move all terms to the left:

-18-(18-3R)=0

We add all the numbers together, and all the variables

-(-3R+18)-18=0

We get rid of parentheses

3R-18-18=0

We add all the numbers together, and all the variables

3R-36=0

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

3R=36

R=36/3

R=12

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