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