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