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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-1 = 6/x // - 6/x
x-(6/x)-1 = 0
x-6*x^-1-1 = 0
1*x^1-6*x^-1-1*x^0 = 0
(1*x^2-1*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1*x^1-6*x^0) = 0
x^1
x^2-x-6 = 0
x^2-x-6 = 0
DELTA = (-1)^2-(-6*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+1)/(1*2) or x = (1-25^(1/2))/(1*2)
x = 3 or x = -2
x in { -2, 3}
x in { -2, 3 }
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