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Krzyś - x+3
Adam - 3x
Ewa za 5 lat - x + 5
Krzyś za 5 lat - x + 3 + 5 = x + 8
Adam za 5 lat - 3x + 5
(x + 5) + (x + 8) = 3x + 5
2x + 13 = 3x + 5
x = 8
Ewa ma osiem lat.