r+6=12+3r

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Solution for r+6=12+3r equation: 



r+6=12+3r

We move all terms to the left:

r+6-(12+3r)=0

We add all the numbers together, and all the variables

r-(3r+12)+6=0

We get rid of parentheses

r-3r-12+6=0

We add all the numbers together, and all the variables

-2r-6=0

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

-2r=6

r=6/-2

r=-3

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