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D( a )
a^2 = 0
a^3 = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a^3 = 0
a^3 = 0
1*a^3 = 0 // : 1
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
a^2-(1*a^2)+a+a+1/(a^2)-(2/(a^3))-4 = 0
a^2-a^2+a+a+1/(a^2)-2*a^-3-4 = 0
2*a+a^-2-2*a^-3-4 = 0
2*a+a^-2-2*a^-3-4
a*(a^-3+2)-2*a^-3-4
a*(a^-3+2)-2*(a^-3+2)
(a-2)*(a^-3+2)
(a-2)*(a^-3+2) = 0
( a-2 )
a-2 = 0 // + 2
a = 2
( a^-3+2 )
1*a^-3 = -2 // : 1
a^-3 = -2
-3 < 0
1/(a^3) = -2 // * a^3
1 = -2*a^3 // : -2
-1/2 = a^3
a^3 = -1/2 // ^ 1/3
a = -(1/2)^(1/3)
a in { 2, -(1/2)^(1/3) }
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