15=7r+2r

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Solution for 15=7r+2r equation: 



15=7r+2r

We move all terms to the left:

15-(7r+2r)=0

We add all the numbers together, and all the variables

-(+9r)+15=0

We get rid of parentheses

-9r+15=0

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

-9r=-15

r=-15/-9

r=1+2/3

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