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D( x )
((2*a^4*x^2)/3)*x = 0
((2*a^4*x^2)/3)*x = 0
((2*a^4*x^2)/3)*x = 0
2/3*a^4*x^3 = 0 // : 2/3*a^4
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((4*a)/9)*x)/(((2*a^4*x^2)/3)*x) = 0
2/3*a^-3*x^-2 = 0 // : 2/3*a^-3
x^-2 = 0
x należy do O
x belongs to the empty set
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