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u in (-oo:+oo)
15/2 = 3*u // - 3*u
15/2-(3*u) = 0
15/2-3*u = 0
15/2-3*u = 0 // - 15/2
-3*u = -15/2 // : -3
u = -15/2/(-3)
u = 5/2
u = 5/2
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