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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 25 // - 25
5/x-25 = 0
5*x^-1 = 25 // : 5
x^-1 = 5
-1 < 0
1/(x^1) = 5 // * x^1
1 = 5*x^1 // : 5
1/5 = x^1
x = 1/5
x = 1/5
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