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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)
5/x = 6/(x^2)+1 // - 6/(x^2)+1
5/x-(6/(x^2))-1 = 0
5/x-6*x^-2-1 = 0
5*x^-1-6*x^-2-1 = 0
t_1 = x^-1
5*t_1^1-6*t_1^2-1 = 0
5*t_1-6*t_1^2-1 = 0
DELTA = 5^2-(-6*(-1)*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-5)/(-6*2) or t_1 = (-1^(1/2)-5)/(-6*2)
t_1 = 1/3 or t_1 = 1/2
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
t_1 = 1/2
x^-1-1/2 = 0
1*x^-1 = 1/2 // : 1
x^-1 = 1/2
-1 < 0
1/(x^1) = 1/2 // * x^1
1 = 1/2*x^1 // : 1/2
2 = x^1
x = 2
x in { 3, 2 }
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