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a in (-oo:+oo)
a/2+a/3 = 2 // - 2
a/2+a/3-2 = 0
5/6*a-2 = 0 // + 2
5/6*a = 2 // : 5/6
a = 2/5/6
a = 12/5
a = 12/5
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