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Odp: Bilet ulgowy kosztuje 15zł.
30/2=15(zł)
ulg.=15zł(zł)
n=15+18=33(zł)
u=n-18
n+n-18=48
u=n-18
2n=66
u=n-18
n=33
u=33-18
n=33
u=15