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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/30-(2*x) = 6/x // - 6/x
24/30-(2*x)-(6/x) = 0
24/30-2*x-6*x^-1 = 0
4/5*x^0-2*x^1-6*x^-1 = 0
(4/5*x^1-2*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(4/5*x^1-2*x^2-6*x^0) = 0
x^1
(4/5)*x-2*x^2-6 = 0
(4/5)*x-2*x^2-6 = 0
DELTA = (4/5)^2-(-6*(-2)*4)
DELTA = -1184/25
DELTA < 0
x in { }
x belongs to the empty set
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