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3+x - ewa (teraz)
x+x+3=87
2x = 87 - 3
2x = 84 | :2
x=42 - marek
ewa - 42+3 = 45
42+5=47
45+5=50
Odp. Za 5 lat Marek będzie miał 47 lat, a Ewa 50 lat.