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a in (-oo:+oo)
5/16 = 3*a // - 3*a
5/16-(3*a) = 0
5/16-3*a = 0
5/16-3*a = 0 // - 5/16
-3*a = -5/16 // : -3
a = -5/16/(-3)
a = 5/48
a = 5/48
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