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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 1/x+2+3 // - 1/x+2+3
y-(1/x)-3-2 = 0
y-x^-1-3-2 = 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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