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D( x )
x < 0
x < 0
x in <0:+oo)
(((((56.3*x^1)/45.6)*x^3)/4)*x^25.4)/1 = 0
((((56.3*x)/45.6)*x^3)/4)*x^25.4 = 0
0.30866228*x^29.4 = 0 // : 0.30866228
x^29.4 = 0
x = 0
x = 0
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