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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 1/x-4-2 // - 1/x-4-2
y-(1/x)+2+4 = 0
y-x^-1+2+4 = 0
-1*x^-1 = -(y+6) // : -1
x^-1 = y+6
-1 < 0
1/(x^1) = y+6 // * x^1
1 = x^1*(y+6) // : y+6
1/(y+6) = x^1
x = 1/(y+6)
x = 1/(y+6)
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