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6.000A + 9.000B = 216.000 ⇒ 2A + 3B = 72
A + B = 28
2A + 3B = 5
3A + 3B = 84
2A + 3B = 72 -
A = 12, B = 16
Jadi, ada 12 majalah A dan 16 majalah B yang terjual.