r+15=4r-9

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Solution for r+15=4r-9 equation: 



r+15=4r-9

We move all terms to the left:

r+15-(4r-9)=0

We get rid of parentheses

r-4r+9+15=0

We add all the numbers together, and all the variables

-3r+24=0

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

-3r=-24

r=-24/-3

r=+8

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