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a in (-oo:+oo)
((1/3)*a-3)*((1/3)*a-3) = 0
(1/3*a-3)^2 = 0
1/3*a-3 = 0 // + 3
1/3*a = 3 // : 1/3
a = 3/1/3
a = 9
a in { 9, 9 }
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