15=8r-5r

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Solution for 15=8r-5r equation: 



15=8r-5r

We move all terms to the left:

15-(8r-5r)=0

We add all the numbers together, and all the variables

-(+3r)+15=0

We get rid of parentheses

-3r+15=0

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

-3r=-15

r=-15/-3

r=+5

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