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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10*x-11 = 6/x // - 6/x
10*x-(6/x)-11 = 0
10*x-6*x^-1-11 = 0
10*x^1-6*x^-1-11*x^0 = 0
(10*x^2-11*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^2-11*x^1-6*x^0) = 0
x^1
10*x^2-11*x-6 = 0
10*x^2-11*x-6 = 0
DELTA = (-11)^2-(-6*4*10)
DELTA = 361
DELTA > 0
x = (361^(1/2)+11)/(2*10) or x = (11-361^(1/2))/(2*10)
x = 3/2 or x = -2/5
x in { -2/5, 3/2}
x in { -2/5, 3/2 }
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