15=r-8

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Solution for 15=r-8 equation: 



15=r-8

We move all terms to the left:

15-(r-8)=0

We get rid of parentheses

-r+8+15=0

We add all the numbers together, and all the variables

-1r+23=0

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

-r=-23

r=-23/-1

r=+23

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