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d in (-oo:+oo)
5/12 = 5*d // - 5*d
5/12-(5*d) = 0
5/12-5*d = 0
5/12-5*d = 0 // - 5/12
-5*d = -5/12 // : -5
d = -5/12/(-5)
d = 1/12
d = 1/12
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