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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-(2/x)-(24/(x^2)) = 0
1-2*x^-1-24*x^-2 = 0
t_1 = x^-1
1-24*t_1^2-2*t_1^1 = 0
1-24*t_1^2-2*t_1 = 0
DELTA = (-2)^2-(-24*1*4)
DELTA = 100
DELTA > 0
t_1 = (100^(1/2)+2)/(-24*2) or t_1 = (2-100^(1/2))/(-24*2)
t_1 = -1/4 or t_1 = 1/6
t_1 = -1/4
x^-1+1/4 = 0
1*x^-1 = -1/4 // : 1
x^-1 = -1/4
-1 < 0
1/(x^1) = -1/4 // * x^1
1 = -1/4*x^1 // : -1/4
-4 = x^1
x = -4
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 in { -4, 6 }
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