15=r+4r

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Solution for 15=r+4r equation: 



15=r+4r

We move all terms to the left:

15-(r+4r)=0

We add all the numbers together, and all the variables

-(+5r)+15=0

We get rid of parentheses

-5r+15=0

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

-5r=-15

r=-15/-5

r=+3

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