15=-r-5

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Solution for 15=-r-5 equation: 



15=-r-5

We move all terms to the left:

15-(-r-5)=0

We add all the numbers together, and all the variables

-(-1r-5)+15=0

We get rid of parentheses

1r+5+15=0

We add all the numbers together, and all the variables

r+20=0

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

r=-20

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