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