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6 3 4*6 - 7*3 24 - 21 3
---- - ----- = ---------------- = ------------- = --------
7 4 28 28 28
3 3 6
Hay que agregar ------- a ------ para obtener -------
28 4 7
Lo comprobamos.
3 3 7*3 + 3 21 + 3 24
----- + ------- = ------------- = ---------- = ------- simplificamos entre 4
4 28 28 28 28
24 : 4 6
------- = --------
28 : 4 7