-18=r+18

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Solution for -18=r+18 equation: 



-18=r+18

We move all terms to the left:

-18-(r+18)=0

We get rid of parentheses

-r-18-18=0

We add all the numbers together, and all the variables

-1r-36=0

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

-r=36

r=36/-1

r=-36

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