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