2r-15=-r

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Solution for 2r-15=-r equation: 



2r-15=-r

We move all terms to the left:

2r-15-(-r)=0

We add all the numbers together, and all the variables

2r-(-1r)-15=0

We get rid of parentheses

2r+1r-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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