12=r-18

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Solution for 12=r-18 equation: 



12=r-18

We move all terms to the left:

12-(r-18)=0

We get rid of parentheses

-r+18+12=0

We add all the numbers together, and all the variables

-1r+30=0

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

-r=-30

r=-30/-1

r=+30

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