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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15 = 375/x // - 375/x
0.15-(375/x) = 0
0.15-375*x^-1 = 0
-375*x^-1 = -0.15 // : -375
x^-1 = 0.0004
-1 < 0
1/(x^1) = 0.0004 // * x^1
1 = 0.0004*x^1 // : 0.0004
2500 = x^1
x = 2500
x = 2500
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