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u in (-oo:+oo)
14/15 = 7*u // - 7*u
14/15-(7*u) = 0
14/15-7*u = 0
14/15-7*u = 0 // - 14/15
-7*u = -14/15 // : -7
u = -14/15/(-7)
u = 2/15
u = 2/15
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