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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5/x = 0.004 // - 0.004
2.5/x-0.004 = 0
2.5*x^-1 = 0.004 // : 2.5
x^-1 = 0.0016
-1 < 0
1/(x^1) = 0.0016 // * x^1
1 = 0.0016*x^1 // : 0.0016
625 = x^1
x = 625
x = 625
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