15=3+2r

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Solution for 15=3+2r equation: 



15=3+2r

We move all terms to the left:

15-(3+2r)=0

We add all the numbers together, and all the variables

-(2r+3)+15=0

We get rid of parentheses

-2r-3+15=0

We add all the numbers together, and all the variables

-2r+12=0

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

-2r=-12

r=-12/-2

r=+6

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