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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x) = x/6 // - x/6
2/(3*x)-(x/6) = 0
2/3*x^-1-1/6*x^1 = 0
(2/3*x^0-1/6*x^2)/(x^1) = 0 // * x^2
x^1*(2/3*x^0-1/6*x^2) = 0
x^1
(-1/6)*x^2+2/3 = 0
(-1/6)*x^2+2/3 = 0
DELTA = 0^2-(4*(-1/6)*(2/3))
DELTA = 4/9
DELTA > 0
x = ((4/9)^(1/2)+0)/(2*(-1/6)) or x = (0-(4/9)^(1/2))/(2*(-1/6))
x = -2 or x = 2
x in { -2, 2}
x in { -2, 2 }
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