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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4*a^2-(a^-3*((6*a^6)/8)) = 0
(-3/4)*a^3+4*a^2 = 0
4*a^2-3/4*a^3 = 0
a^2*(4-3/4*a) = 0
4-3/4*a = 0 // - 4
-3/4*a = -4 // : -3/4
a = -4/(-3/4)
a = 16/3
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in { 0}
a = 16/3
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