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