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x-wiek siostry
x+10=3x
10=2x
x=5 wiek siostry
y-wiek brata
3*x=y
y=x+10
3x-x=10
2x=10/:2
x=5lat-wiek siostry
3*x=y
3*5=15lat-wiek brata
odp.siostra ma 5 lat