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