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Jadi 2 + 5 = 7 dan 5 - 2 = 3
63 x = 27
Jadi selisihnya adalah 27 buku bacaan
Buku Haikal=2/7×63=2×9=18 buku
Buku Mario=5/7×63=5×9=45 buku
Selisih=45-18=27 buku