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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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