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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-6+2 = 6/x-6 // - 6/x-6
X/x-(6/x)-6+2+6 = 0
X/x-6*x^-1-6+2+6 = 0
X*x^-1-6*x^-1+2 = 0
t_1 = x^-1
X*t_1^1-6*t_1^1+2 = 0
2-6*t_1 = 0 // - 2
-6*t_1 = -2 // : -6
t_1 = -2/(-6)
t_1 = 1/3
t_1 = 1/3
x^-1-1/3 = 0
1*x^-1 = 1/3 // : 1
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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