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{3y=x
{y-6=x
{3y=x
{y-6=-3y
{3y=x
{2y=6/2
{3y=x
{y=3
{3*3=x
{y=3
{x=9
{y=3
Odp. Siostra ma ma trzy lata.
((;
9-wiek brata
9-6=3
wiek siostry
odp: Siostra ma 3 latka.
:)