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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x^2 = 6/x-1 // - 6/x-1
5*x^2-(6/x)+1 = 0
5*x^2-6*x^-1+1 = 0
5*x^2-6*x^-1+1*x^0 = 0
(5*x^3+1*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^3+1*x^1-6*x^0) = 0
x^1
5*x^3+x-6 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6 }
1
x = 1
5*x^3+x-6 = 0
1
x-1
5*x^2+5*x+6
5*x^3+x-6
x-1
5*x^2-5*x^3
5*x^2+x-6
5*x-5*x^2
6*x-6
6-6*x
0
5*x^2+5*x+6 = 0
DELTA = 5^2-(4*5*6)
DELTA = -95
DELTA < 0
x in { 1}
x = 1
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