r^2-5r=r(r+1)

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Solution for r^2-5r=r(r+1) equation: 



r^2-5r=r(r+1)

We move all terms to the left:

r^2-5r-(r(r+1))=0



We calculate terms in parentheses: -(r(r+1)), so:

r(r+1)

We multiply parentheses

r^2+r

Back to the equation:

-(r^2+r)



We get rid of parentheses

r^2-r^2-5r-r=0

We add all the numbers together, and all the variables

-6r=0

r=0/-6

r=0

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