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