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D( x )
x < 0
x < 0
x in <0:+oo)
(300*x^0.069*x^1)/2 = 0
(300*x^0.069*x)/2 = 0
150*x^1.069 = 0 // : 150
x^1.069 = 0
x = 0
x = 0
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