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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/3 = 10-(24/x) // - 10-(24/x)
(2*x)/3+24/x-10 = 0
2/3*x^1+24*x^-1-10*x^0 = 0
(2/3*x^2-10*x^1+24*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2-10*x^1+24*x^0) = 0
x^1
(2/3)*x^2-10*x+24 = 0
(2/3)*x^2-10*x+24 = 0
DELTA = (-10)^2-(4*24*(2/3))
DELTA = 36
DELTA > 0
x = (36^(1/2)+10)/(2*(2/3)) or x = (10-36^(1/2))/(2*(2/3))
x = 12 or x = 3
x in { 3, 12}
x in { 3, 12 }
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