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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 100*(15/x) // - 100*(15/x)
4-(100*(15/x)) = 0
4-1500*x^-1 = 0
-1500*x^-1 = -4 // : -1500
x^-1 = 1/375
-1 < 0
1/(x^1) = 1/375 // * x^1
1 = 1/375*x^1 // : 1/375
375 = x^1
x = 375
x = 375
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