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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = 1/x-3+5 // - 1/x-3+5
Y-(1/x)-5+3 = 0
Y-x^-1-5+3 = 0
-1*x^-1 = -(Y-2) // : -1
x^-1 = Y-2
-1 < 0
1/(x^1) = Y-2 // * x^1
1 = x^1*(Y-2) // : Y-2
1/(Y-2) = x^1
x = 1/(Y-2)
x = 1/(Y-2)
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