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D( a )
a = 0
4*a = 0
a = 0
a = 0
4*a = 0
4*a = 0
4*a = 0 // : 4
a = 0
a in (-oo:0) U (0:+oo)
(((4*a)^0*(3*a^-5)^2)/10)*a^-6 = 0
(((3*a^-5)^2)/10)*a^-6 = 0
9/10*a^-16 = 0 // : 9/10
a^-16 = 0
a naleu017Cy do O
a belongs to the empty set
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