-3u(u-7)(u+3)=0

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Solution for -3u(u-7)(u+3)=0 equation: 



-3u(u-7)(u+3)=0

We multiply parentheses ..

-3u(+u^2+3u-7u-21)=0

We multiply parentheses

-3u^3-9u^2+21u^2+63u=0

We do not support eupression: u^3

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