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