R=-18+4r

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Solution for R=-18+4r equation: 



=-18+4R

We move all terms to the left:

-(-18+4R)=0

We add all the numbers together, and all the variables

-(4R-18)=0

We get rid of parentheses

-4R+18=0

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

-4R=-18

R=-18/-4

R=4+1/2

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