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Mathematics, 23.06.2019 17:30 mathlady12

Sistemi lineari un libraio osserva che ha venduto 32 libri dal primo scaffale e 91 dal secondo; in questo modo i libri rimasti nel primo scaffale sono esattamente il doppio di quelli rimasti nel secondo. quanti libri c'erano all'inizio su ogni scaffale se i due scaffali contenevano lo stesso numero di libri?

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