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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(15/12)*x = 6/x // - 6/x
(15/12)*x-(6/x) = 0
(15/12)*x-6*x^-1 = 0
5/4*x^1-6*x^-1 = 0
(5/4*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(5/4*x^2-6*x^0) = 0
x^1
(5/4)*x^2-6 = 0
(5/4)*x^2-6 = 0
DELTA = 0^2-(-6*4*(5/4))
DELTA = 30
DELTA > 0
x = (30^(1/2)+0)/(2*(5/4)) or x = (0-30^(1/2))/(2*(5/4))
x = 2/5*30^(1/2) or x = 2/5*30^(1/2)
x in { 2/5*30^(1/2), 2/5*30^(1/2)}
x in { 2/5*30^(1/2), 2/5*30^(1/2) }
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