r(r-5)(r+18)=0

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Solution for r(r-5)(r+18)=0 equation: 



r(r-5)(r+18)=0

We multiply parentheses ..

r(+r^2+18r-5r-90)=0

We multiply parentheses

r^3+18r^2-5r^2-90r=0

We do not support erpression: r^3

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