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