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y - licza pięciozłotówek
x=7y
2x+5y=323
x=7y
2×7y+5y=323
x=7y
19y=323 /:19
x=7y
y=17
x=7×17=119
y=17
odp.miala 119 dwuzłotówek i 17 pięciozłotówek.