15=r+3r=

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Solution for 15=r+3r= equation: 



15=r+3r=

We move all terms to the left:

15-(r+3r)=0

We add all the numbers together, and all the variables

-(+4r)+15=0

We get rid of parentheses

-4r+15=0

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

-4r=-15

r=-15/-4

r=3+3/4

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