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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-((2/3)*x) = (1/15)*x // - (1/15)*x
1/x-((2/3)*x)-((1/15)*x) = 0
(-2/3)*x+(-1/15)*x+1/x = 0
1*x^-1-11/15*x^1 = 0
(1*x^0-11/15*x^2)/(x^1) = 0 // * x^2
x^1*(1*x^0-11/15*x^2) = 0
x^1
(-11/15)*x^2+1 = 0
(-11/15)*x^2+1 = 0
DELTA = 0^2-(1*4*(-11/15))
DELTA = 44/15
DELTA > 0
x = ((44/15)^(1/2)+0)/(2*(-11/15)) or x = (0-(44/15)^(1/2))/(2*(-11/15))
x = -15/22*(44/15)^(1/2) or x = 15/22*(44/15)^(1/2)
x in { -15/22*(44/15)^(1/2), 15/22*(44/15)^(1/2)}
x in { -15/22*(44/15)^(1/2), 15/22*(44/15)^(1/2) }
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