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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/11 = x-(5/x)-10 // - x-(5/x)-10
5/x-x+9/11+10 = 0
5*x^-1-1*x^1+119/11*x^0 = 0
(119/11*x^1-1*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(119/11*x^1-1*x^2+5*x^0) = 0
x^1
(119/11)*x-x^2+5 = 0
(119/11)*x-x^2+5 = 0
DELTA = (119/11)^2-(-1*4*5)
DELTA = 16581/121
DELTA > 0
x = ((16581/121)^(1/2)-(119/11))/(-1*2) or x = (-(119/11)-(16581/121)^(1/2))/(-1*2)
x = ((16581/121)^(1/2)-119/11)/(-2) or x = ((16581/121)^(1/2)+119/11)/2
x in { ((16581/121)^(1/2)-119/11)/(-2), ((16581/121)^(1/2)+119/11)/2}
x in { ((16581/121)^(1/2)-119/11)/(-2), ((16581/121)^(1/2)+119/11)/2 }
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