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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(14/3)*x = 20/x-5 // - 20/x-5
(14/3)*x-(20/x)+5 = 0
(14/3)*x-20*x^-1+5 = 0
14/3*x^1-20*x^-1+5*x^0 = 0
(14/3*x^2+5*x^1-20*x^0)/(x^1) = 0 // * x^2
x^1*(14/3*x^2+5*x^1-20*x^0) = 0
x^1
(14/3)*x^2+5*x-20 = 0
(14/3)*x^2+5*x-20 = 0
DELTA = 5^2-(-20*4*(14/3))
DELTA = 1195/3
DELTA > 0
x = ((1195/3)^(1/2)-5)/(2*(14/3)) or x = (-(1195/3)^(1/2)-5)/(2*(14/3))
x = 3/28*((1195/3)^(1/2)-5) or x = -3/28*((1195/3)^(1/2)+5)
x in { -3/28*((1195/3)^(1/2)+5), 3/28*((1195/3)^(1/2)-5)}
x in { -3/28*((1195/3)^(1/2)+5), 3/28*((1195/3)^(1/2)-5) }
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