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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-(1/x) = (10/3)*x // - (10/3)*x
5-((10/3)*x)-(1/x) = 0
(-10/3)*x-x^-1+5 = 0
5*x^0-10/3*x^1-1*x^-1 = 0
(5*x^1-10/3*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-10/3*x^2-1*x^0) = 0
x^1
(-10/3)*x^2+5*x-1 = 0
(-10/3)*x^2+5*x-1 = 0
DELTA = 5^2-(-1*4*(-10/3))
DELTA = 35/3
DELTA > 0
x = ((35/3)^(1/2)-5)/(2*(-10/3)) or x = (-(35/3)^(1/2)-5)/(2*(-10/3))
x = -3/20*((35/3)^(1/2)-5) or x = 3/20*((35/3)^(1/2)+5)
x in { -3/20*((35/3)^(1/2)-5), 3/20*((35/3)^(1/2)+5)}
x in { -3/20*((35/3)^(1/2)-5), 3/20*((35/3)^(1/2)+5) }
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