15=r/3+13

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Solution for 15=r/3+13 equation: 



15=r/3+13

We move all terms to the left:

15-(r/3+13)=0

We get rid of parentheses

-r/3-13+15=0

We multiply all the terms by the denominator


-r-13*3+15*3=0

We add all the numbers together, and all the variables

-1r+6=0

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

-r=-6

r=-6/-1

r=+6

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