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D( x )
x^3-(2*x^4) = 0
x^3-(2*x^4) = 0
x^3-(2*x^4) = 0
x^3-2*x^4 = 0
x^3-2*x^4 = 0
x^3*(1-2*x) = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:1/2) U (1/2:+oo)
(-4*x^3)/(x^3-(2*x^4)) = 0
(-4*x^3)/(x^3-2*x^4) = 0
x^3-2*x^4 = 0
x^3*(1-2*x) = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x^3*(x-1/2) = 0
(-4*x^3)/(x^3*(x-1/2)) = 0
-4*x^3 = 0 // : -4
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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