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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(6/(x^2)) = 0
1/x-6*x^-2 = 0
x^-1-6*x^-2 = 0
t_1 = x^-1
1*t_1^1-6*t_1^2 = 0
t_1-6*t_1^2 = 0
DELTA = 1^2-(-6*0*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(-6*2) or t_1 = (-1^(1/2)-1)/(-6*2)
t_1 = 0 or t_1 = 1/6
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
t_1 = 1/6
x^-1-1/6 = 0
1*x^-1 = 1/6 // : 1
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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