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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)
6-(1/x)-(6/(x^2)) = 0
6-x^-1-6*x^-2 = 0
t_1 = x^-1
6-6*t_1^2-1*t_1^1 = 0
6-6*t_1^2-t_1 = 0
DELTA = (-1)^2-(-6*4*6)
DELTA = 145
DELTA > 0
t_1 = (145^(1/2)+1)/(-6*2) or t_1 = (1-145^(1/2))/(-6*2)
t_1 = (145^(1/2)+1)/(-12) or t_1 = (1-145^(1/2))/(-12)
t_1 = (145^(1/2)+1)/(-12)
x^-1-((145^(1/2)+1)/(-12)) = 0
1*x^-1 = (145^(1/2)+1)/(-12) // : 1
x^-1 = (145^(1/2)+1)/(-12)
-1 < 0
1/(x^1) = (145^(1/2)+1)/(-12) // * x^1
1 = ((145^(1/2)+1)/(-12))*x^1 // : (145^(1/2)+1)/(-12)
-12*(145^(1/2)+1)^-1 = x^1
x = -12*(145^(1/2)+1)^-1
t_1 = (1-145^(1/2))/(-12)
x^-1-((1-145^(1/2))/(-12)) = 0
1*x^-1 = (1-145^(1/2))/(-12) // : 1
x^-1 = (1-145^(1/2))/(-12)
-1 < 0
1/(x^1) = (1-145^(1/2))/(-12) // * x^1
1 = ((1-145^(1/2))/(-12))*x^1 // : (1-145^(1/2))/(-12)
-12*(1-145^(1/2))^-1 = x^1
x = -12*(1-145^(1/2))^-1
x in { -12*(145^(1/2)+1)^-1, -12*(1-145^(1/2))^-1 }
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