4z(z+7)(z-2)=0

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Solution for 4z(z+7)(z-2)=0 equation: 



4z(z+7)(z-2)=0

We multiply parentheses ..

4z(+z^2-2z+7z-14)=0

We multiply parentheses

4z^3-8z^2+28z^2-56z=0

We do not support ezpression: z^3

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