15+5r=3r-r

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Solution for 15+5r=3r-r equation: 



15+5r=3r-r

We move all terms to the left:

15+5r-(3r-r)=0

We add all the numbers together, and all the variables

5r-(+2r)+15=0

We get rid of parentheses

5r-2r+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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