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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/3)*x-2 = 10/x // - 10/x
(5/3)*x-(10/x)-2 = 0
(5/3)*x-10*x^-1-2 = 0
5/3*x^1-10*x^-1-2*x^0 = 0
(5/3*x^2-2*x^1-10*x^0)/(x^1) = 0 // * x^2
x^1*(5/3*x^2-2*x^1-10*x^0) = 0
x^1
(5/3)*x^2-2*x-10 = 0
(5/3)*x^2-2*x-10 = 0
DELTA = (-2)^2-(-10*4*(5/3))
DELTA = 212/3
DELTA > 0
x = ((212/3)^(1/2)+2)/(2*(5/3)) or x = (2-(212/3)^(1/2))/(2*(5/3))
x = 3/10*((212/3)^(1/2)+2) or x = 3/10*(2-(212/3)^(1/2))
x in { 3/10*(2-(212/3)^(1/2)), 3/10*((212/3)^(1/2)+2)}
x in { 3/10*(2-(212/3)^(1/2)), 3/10*((212/3)^(1/2)+2) }
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