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a in (-oo:+oo)
(1/3)*a-6*a+3 = 1/6 // - 1/6
(1/3)*a-6*a-(1/6)+3 = 0
(1/3)*a-6*a-1/6+3 = 0
17/6-17/3*a = 0 // - 17/6
-17/3*a = -17/6 // : -17/3
a = -17/6/(-17/3)
a = 1/2
a = 1/2
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