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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/75 = 250/x // - 250/x
5/75-(250/x) = 0
5/75-250*x^-1 = 0
-250*x^-1 = -1/15 // : -250
x^-1 = 1/3750
-1 < 0
1/(x^1) = 1/3750 // * x^1
1 = 1/3750*x^1 // : 1/3750
3750 = x^1
x = 3750
x = 3750
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