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y - wiek Ewy
/x + y = 33
\x - y = 33 : 3
/x = 33 - y
\33 - y - y = 11
/x = 33 - y
\-2y = -22 /:(-2)
/x = 33 - y
\y = 11
x = 33:3 =11-wiek Ewy czyli y = 11
Odp. Krysia ma 22 lata , a Ewa 11.