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6 - x - liczba blietów normalnych
x * 8 + (6-x) * 16 = 64
8x + 96 - 16x = 64
8x - 16x = 64 - 96
-8x = -32/ (-8)
x = 4
6-4 = 2
Odp. Kupiono 4 bilety ulgowe i 2 bilety normalne.