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y-bilety ulgowe
x+y=24
x=24-y
16x+11y=289
16*(24-y)+11y=289
384-16y+11y=289
-5y=289-384
-5y=-95/:(-5)
y=19
x+y=24
x+19=24
x=24-19
x=5
odp kupiono 5 biletów normalnych i 11 ulgowych
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