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D( x )
x = 0
2/x-3+1 = 0
x = 0
x = 0
2/x-3+1 = 0
2/x-3+1 = 0
2*x^-1 = 2 // : 2
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(1-(4/x)-3)/(2/x-3+1) = 0
(1-4*x^-1-3)/(2/x-3+1) = 0
(-4*x^-1-2)/(2*x^-1-2) = 0
-4*x^-1 = 2 // : -4
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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