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x=3y
3y=y+8
x=3y
2y=8
x=3y
y=4
x=12
Odp. Kasia ma 4lata.
wiek
kasia = x
Jola= x+8
Ela= 3x
3x=x+8
4x=8 /4
x=2
wiek kasi =2lata