R=21+b

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Solution for R=21+b equation: 



=21+R

We move all terms to the left:

-(21+R)=0

We add all the numbers together, and all the variables

-(R+21)=0

We get rid of parentheses

-R-21=0

We add all the numbers together, and all the variables

-1R-21=0

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

-R=21

R=21/-1

R=-21

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