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