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d in (-oo:+oo)
12/7 = 60*d // - 60*d
12/7-(60*d) = 0
12/7-60*d = 0
12/7-60*d = 0 // - 12/7
-60*d = -12/7 // : -60
d = -12/7/(-60)
d = 1/35
d = 1/35
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