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)=0

We get rid of parentheses

r+4r=0

We add all the numbers together, and all the variables

5r=0

r=0/5

r=0

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