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a in (-oo:+oo)
5/2 = a+3/8 // - a+3/8
5/2-a-(3/8) = 0
5/2-a-3/8 = 0
17/8-a = 0 // - 17/8
-a = -17/8 // * -1
a = 17/8
a = 17/8
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