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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/5)*x+3/x-6 = 0
3/5*x^1+3*x^-1-6*x^0 = 0
(3/5*x^2-6*x^1+3*x^0)/(x^1) = 0 // * x^2
x^1*(3/5*x^2-6*x^1+3*x^0) = 0
x^1
(3/5)*x^2-6*x+3 = 0
(3/5)*x^2-6*x+3 = 0
DELTA = (-6)^2-(3*4*(3/5))
DELTA = 144/5
DELTA > 0
x = ((144/5)^(1/2)+6)/(2*(3/5)) or x = (6-(144/5)^(1/2))/(2*(3/5))
x = 5/6*((144/5)^(1/2)+6) or x = 5/6*(6-(144/5)^(1/2))
x in { 5/6*(6-(144/5)^(1/2)), 5/6*((144/5)^(1/2)+6)}
x in { 5/6*(6-(144/5)^(1/2)), 5/6*((144/5)^(1/2)+6) }
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