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