-30=r-18

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Solution for -30=r-18 equation: 



-30=r-18

We move all terms to the left:

-30-(r-18)=0

We get rid of parentheses

-r+18-30=0

We add all the numbers together, and all the variables

-1r-12=0

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

-r=12

r=12/-1

r=-12

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