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