15=-4r-9

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Solution for 15=-4r-9 equation: 



15=-4r-9

We move all terms to the left:

15-(-4r-9)=0

We get rid of parentheses

4r+9+15=0

We add all the numbers together, and all the variables

4r+24=0

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

4r=-24

r=-24/4

r=-6

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