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D( x )
x < 0
x < 0
x in <0:+oo)
(6.12*x^3.14*x^4*x^6.12*x^6.12)/3 = 0
2.04*x^19.38 = 0 // : 2.04
x^19.38 = 0
x = 0
x = 0
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