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15-7 sobre 5 - 3-8sobre4
12/5-(-5/4) igual 60 + 25 sobre 20
igual a
85/20 le sacas quinta y quedaría 17/4
(15/5-7/5)-(3/4-8/4)
8/5-(-5/4)
8/5+5/4=32/20+25/20=57/20