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D( x )
x < 0
x < 0
x in <0:+oo)
x^(10^-2)*((6*x^(10^5))/3.9) = 0
1.53846154*x^(10000001/100) = 0 // : 1.53846154
x^(10000001/100) = 0
x = 0
x = 0
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