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