18=r-3

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Solution for 18=r-3 equation: 



18=r-3

We move all terms to the left:

18-(r-3)=0

We get rid of parentheses

-r+3+18=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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