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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(14/6)*x-(1/x)+13 = (1/13)*x-9 // - (1/13)*x-9
(14/6)*x-((1/13)*x)-(1/x)+9+13 = 0
(14/6)*x+(-1/13)*x-x^-1+9+13 = 0
88/39*x^1-1*x^-1+22*x^0 = 0
(88/39*x^2+22*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(88/39*x^2+22*x^1-1*x^0) = 0
x^1
(88/39)*x^2+22*x-1 = 0
(88/39)*x^2+22*x-1 = 0
DELTA = 22^2-(-1*4*(88/39))
DELTA = 19228/39
DELTA > 0
x = ((19228/39)^(1/2)-22)/(2*(88/39)) or x = (-(19228/39)^(1/2)-22)/(2*(88/39))
x = 39/176*((19228/39)^(1/2)-22) or x = -39/176*((19228/39)^(1/2)+22)
x in { -39/176*((19228/39)^(1/2)+22), 39/176*((19228/39)^(1/2)-22)}
x in { -39/176*((19228/39)^(1/2)+22), 39/176*((19228/39)^(1/2)-22) }
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