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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.04 // - 0.04
1/x-0.04 = 0
1*x^-1 = 0.04 // : 1
x^-1 = 0.04
-1 < 0
1/(x^1) = 0.04 // * x^1
1 = 0.04*x^1 // : 0.04
25 = x^1
x = 25
x = 25
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