R-20=20-r

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Solution for R-20=20-r equation: 



-20=20-R

We move all terms to the left:

-20-(20-R)=0

We add all the numbers together, and all the variables

-(-1R+20)-20=0

We get rid of parentheses

1R-20-20=0

We add all the numbers together, and all the variables

R-40=0

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

R=40

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