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ulgowy - y --> 33 zł
x+y=48 <-- x+33=48 x=48-33 x=15
y-18=x
x+y=48
-x+y=18
2y=66/2
y=33
u.-ulgowy
n.+u=48
u=n-18
n+u-18=48
2n-18=48
2n=48+18
n=66:2=33
u.= 33-18=15
n.=33zł.
u.=15zł.