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y - liczba osob z biletem ulgowym
8x+5y = 2640
x+y=420/x(-8)
8x+5y=2640
-8x-8y=-3360
+
-3y=-720/:(-3)
y=240
8x+5y=2640
8x+1200=2640
8x=1440/8
x=180
Odp. Bilet normalny kupilo 180 osob, a ulgowy 240 osob.