18=r-4

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Solution for 18=r-4 equation: 



18=r-4

We move all terms to the left:

18-(r-4)=0

We get rid of parentheses

-r+4+18=0

We add all the numbers together, and all the variables

-1r+22=0

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

-r=-22

r=-22/-1

r=+22

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