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D( x )
x < 0
x < 0
x in <0:+oo)
x^0.0015*((1.4*x^0.009*x^20)/48)*x^200 = 0
0.02916667*x^220.0105 = 0 // : 0.02916667
x^220.0105 = 0
x = 0
x = 0
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