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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/3)*x-9 = 2/x // - 2/x
(5/3)*x-(2/x)-9 = 0
(5/3)*x-2*x^-1-9 = 0
5/3*x^1-2*x^-1-9*x^0 = 0
(5/3*x^2-9*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(5/3*x^2-9*x^1-2*x^0) = 0
x^1
(5/3)*x^2-9*x-2 = 0
(5/3)*x^2-9*x-2 = 0
DELTA = (-9)^2-(-2*4*(5/3))
DELTA = 283/3
DELTA > 0
x = ((283/3)^(1/2)+9)/(2*(5/3)) or x = (9-(283/3)^(1/2))/(2*(5/3))
x = 3/10*((283/3)^(1/2)+9) or x = 3/10*(9-(283/3)^(1/2))
x in { 3/10*(9-(283/3)^(1/2)), 3/10*((283/3)^(1/2)+9)}
x in { 3/10*(9-(283/3)^(1/2)), 3/10*((283/3)^(1/2)+9) }
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