15=r-6=5

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Solution for 15=r-6=5 equation: 



15=r-6=5

We move all terms to the left:

15-(r-6)=0

We get rid of parentheses

-r+6+15=0

We add all the numbers together, and all the variables

-1r+21=0

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

-r=-21

r=-21/-1

r=+21

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