x в кубе - x в квадрате - 4x - 4= 0
x^2(x-1)-4(x+1)=0
(x^2-4)(x+1)(x-1)=0
x-1=0 x+1=0 x^2-4=0
x=1 x=-1 x=2 x=-2
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x^2(x-1)-4(x+1)=0
(x^2-4)(x+1)(x-1)=0
x-1=0 x+1=0 x^2-4=0
x=1 x=-1 x=2 x=-2