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