72=3r+6r

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Solution for 72=3r+6r equation: 



72=3r+6r

We move all terms to the left:

72-(3r+6r)=0

We add all the numbers together, and all the variables

-(+9r)+72=0

We get rid of parentheses

-9r+72=0

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

-9r=-72

r=-72/-9

r=+8

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