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a in (-oo:+oo)
1/6-(3*a) = 5/3 // - 5/3
1/6-(3*a)-(5/3) = 0
1/6-3*a-5/3 = 0
-3*a-3/2 = 0 // + 3/2
-3*a = 3/2 // : -3
a = 3/2/(-3)
a = -1/2
a = -1/2
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