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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15.2/1000 = 500000/x // - 500000/x
15.2/1000-(500000/x) = 0
15.2/1000-500000*x^-1 = 0
-500000*x^-1 = -0.0152 // : -500000
x^-1 = 0.00000003
-1 < 0
1/(x^1) = 0.00000003 // * x^1
1 = 0.00000003*x^1 // : 0.00000003
33333333.33333333 = x^1
x = 33333333.33333333
x = 33333333.33333333
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