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2 zł - 7x
razem - 323
5x + 2 * 7x = 323
5x + 14 x = 323
19 x = 323 / : 19
x = 17
5zł - 17
2zł - 17 * 7 = 119
Ma 17 pięciozłotówek i 119 dwuzłotówek