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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 2/x-6 // - 2/x-6
3/x-(2/x)+6 = 0
3/x-2*x^-1+6 = 0
1*x^-1 = -6 // : 1
x^-1 = -6
-1 < 0
1/(x^1) = -6 // * x^1
1 = -6*x^1 // : -6
-1/6 = x^1
x = -1/6
x = -1/6
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