-18=r-7r

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Solution for -18=r-7r equation: 



-18=r-7r

We move all terms to the left:

-18-(r-7r)=0

We add all the numbers together, and all the variables

-(-6r)-18=0

We get rid of parentheses

6r-18=0

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

6r=18

r=18/6

r=3

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