x^3+4x^2-21x=0
x(x^2+4x-21)=0
x(x+7)(x-3)=0
x1=0
x2=-7
x3=3
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x^3+4x^2-21x=0
x(x^2+4x-21)=0
x(x+7)(x-3)=0
x1=0
x2=-7
x3=3