18=r+6-3r

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Solution for 18=r+6-3r equation: 



18=r+6-3r

We move all terms to the left:

18-(r+6-3r)=0

We add all the numbers together, and all the variables

-(-2r+6)+18=0

We get rid of parentheses

2r-6+18=0

We add all the numbers together, and all the variables

2r+12=0

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

2r=-12

r=-12/2

r=-6

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