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