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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-4+8 = 4/x-4 // - 4/x-4
X/x-(4/x)-4+4+8 = 0
X/x-4*x^-1-4+4+8 = 0
X*x^-1-4*x^-1+8 = 0
t_1 = x^-1
X*t_1^1-4*t_1^1+8 = 0
8-4*t_1 = 0 // - 8
-4*t_1 = -8 // : -4
t_1 = -8/(-4)
t_1 = 2
t_1 = 2
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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