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y-wiek Basi
x+y=28
x-4=3(y-4)
x=28-y
x-4=3(y-4)
x-4=3y-12
28-y-4=3y-12
24-y=3y-12
24+12=3y+y
36=4y
y=9
x=28-y
x=28-9
x=19
ODP.:Jola ma obecnie 19 lat, a Basia 9.