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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/20)*x = 6/x // - 6/x
(3/20)*x-(6/x) = 0
(3/20)*x-6*x^-1 = 0
3/20*x^1-6*x^-1 = 0
(3/20*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(3/20*x^2-6*x^0) = 0
x^1
(3/20)*x^2-6 = 0
(3/20)*x^2-6 = 0
DELTA = 0^2-(-6*4*(3/20))
DELTA = 18/5
DELTA > 0
x = ((18/5)^(1/2)+0)/(2*(3/20)) or x = (0-(18/5)^(1/2))/(2*(3/20))
x = 10/3*(18/5)^(1/2) or x = 10/3*(18/5)^(1/2)
x in { 10/3*(18/5)^(1/2), 10/3*(18/5)^(1/2)}
x in { 10/3*(18/5)^(1/2), 10/3*(18/5)^(1/2) }
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