r+15=4r-

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Solution for r+15=4r- equation: 



r+15=4r-

We move all terms to the left:

r+15-(4r-)=0

We add all the numbers together, and all the variables

r-(+4r)+15=0

We get rid of parentheses

r-4r+15=0

We add all the numbers together, and all the variables

-3r+15=0

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

-3r=-15

r=-15/-3

r=+5

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