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a in (-oo:+oo)
3*a^2-(a*((4*a^2)/2))+2*a*a = 0
3*a^2-2*a^3+2*a*a = 0
5*a^2-2*a^3 = 0
a^2*(5-2*a) = 0
5-2*a = 0 // - 5
-2*a = -5 // : -2
a = -5/(-2)
a = 5/2
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a in { 5/2, 0 }
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