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D( a )
a^2 = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in (-oo:0) U (0:+oo)
4*a-(6*a)-(24/(a^2)) = 0
4*a-6*a-24*a^-2 = 0
-2*a-24*a^-2 = 0
-2*a*(12*a^-3+1) = 0
12*a^-3 = -1 // : 12
a^-3 = -1/12
-3 < 0
1/(a^3) = -1/12 // * a^3
1 = -1/12*a^3 // : -1/12
-12 = a^3
a^3 = -12 // ^ 1/3
a = -12^(1/3)
-2*a = 0
-2*a = 0 // : -2
a = 0
a in { 0}
a = -12^(1/3)
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