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21*2 = 42
21 + 42 = 63 :)
licze na naj :D
2x - liczba lat mamy
x + 2x = 63
3x = 63 |:3
x = 21
2 razy 21 = 42
spr. 42+21 = 63
odp. Córka ma 21 lat, a mama - 42 lata.