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a in (-oo:+oo)
5/8 = a/16 // - a/16
5/8-(a/16) = 0
5/8-1/16*a = 0 // - 5/8
-1/16*a = -5/8 // : -1/16
a = -5/8/(-1/16)
a = 10
a = 10
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