3r=15-r-r

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Solution for 3r=15-r-r equation: 



3r=15-r-r

We move all terms to the left:

3r-(15-r-r)=0

We add all the numbers together, and all the variables

3r-(-2r+15)=0

We get rid of parentheses

3r+2r-15=0

We add all the numbers together, and all the variables

5r-15=0

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

5r=15

r=15/5

r=3

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