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