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D( a )
(2*a)^3 = 0
(2*a)^3 = 0
(2*a)^3 = 0
8*a^3 = 0 // : 8
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
(4*6*a*a^4)/((2*a)^3) = 27 // - 27
(4*6*a*a^4)/((2*a)^3)-27 = 0
3*a^2 = 27 // : 3
a^2 = 9
a^2 = 9 // ^ 1/2
abs(a) = 3
a = 3 or a = -3
a in { 3, -3 }
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