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B-wiek brata
Odp: Ania ma 12 lat a jej brat 6 lat
2x - 3 = 3 * (x - 3)
2x - 3 = 3x - 9
2x - 3x = -9 + 3
-x = -6
x = 6
Wiek obecny:
Ania 2x = 2 * 6 = 12 lat--------------wynik
brat x = 6 lat--------------------wynik