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x in (-oo:+oo)
2*x^3+((8*x)/2)*x = 0
2*x^3+4*x^2 = 0
2*x^2*(x+2) = 0
x+2 = 0 // - 2
x = -2
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in { -2, 0 }
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