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a in (-oo:+oo)
6*a^3-(((27*a^2)/3)*a^2) = 0
6*a^3-9*a^4 = 0
6*a^3-9*a^4 = 0
3*a^3*(2-3*a) = 0
2-3*a = 0 // - 2
-3*a = -2 // : -3
a = -2/(-3)
a = 2/3
3*a^3 = 0
3*a^3 = 0 // : 3
a^3 = 0
a = 0
a in { 2/3, 0 }
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