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a in (-oo:+oo)
a/2 = a/7+5/2 // - a/7+5/2
a/2-(a/7)-(5/2) = 0
a/2-(a/7)-5/2 = 0
5/14*a-5/2 = 0 // + 5/2
5/14*a = 5/2 // : 5/14
a = 5/2/5/14
a = 7
a = 7
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