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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 - 11
y = 11
x = 22
y = 11
Odp. Krysia ma lat 22, Ewa 11