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D( x )
x^3-(5*x^4) = 0
x^3-(5*x^4) = 0
x^3-(5*x^4) = 0
x^3-5*x^4 = 0
x^3-5*x^4 = 0
x^3*(1-5*x) = 0
1-5*x = 0 // - 1
-5*x = -1 // : -5
x = -1/(-5)
x = 1/5
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:1/5) U (1/5:+oo)
(-14*x^3)/(x^3-(5*x^4)) = 0
(-14*x^3)/(x^3-5*x^4) = 0
x^3-5*x^4 = 0
x^3*(1-5*x) = 0
1-5*x = 0 // - 1
-5*x = -1 // : -5
x = -1/(-5)
x = 1/5
x^3*(x-1/5) = 0
(-14*x^3)/(x^3*(x-1/5)) = 0
-14*x^3 = 0 // : -14
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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