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a in (-oo:+oo)
3/8-(8*a) = -5721/104 // + -5721/104
3/8-(8*a)-(-5721/104) = 0
3/8-8*a+5721/104 = 0
720/13-8*a = 0 // - 720/13
-8*a = -720/13 // : -8
a = -720/13/(-8)
a = 90/13
a = 90/13
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