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8=3x-x
8=2x
x=4
odp. kasia ma 4 lata.
8+x - wiek Joli
3x - wiek Eli
8+x = 3x
2x=8
x=4
4 lata - wiek Kasi
12 lat - wiek Joli
12 lat - wiek Eli
Jola 12lat
Ela12