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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2 = 15000/x // - 15000/x
0.2-(15000/x) = 0
0.2-15000*x^-1 = 0
-15000*x^-1 = -0.2 // : -15000
x^-1 = 0.00001333
-1 < 0
1/(x^1) = 0.00001333 // * x^1
1 = 0.00001333*x^1 // : 0.00001333
75018.75468867 = x^1
x = 75018.75468867
x = 75018.75468867
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