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