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x - wiek Grzesia obecnie
Dane:
x + 3 = 3(x - 3)
Rozwiązanie:
x + 3 = 3(x - 3)
x + 3 = 3x - 9
x = 3x - 9 - 3
x - 3x = -9 - 3
-2x = -12 |:(-2)
x = 6
Odpowiedź:
Obecnie Grześ ma 6 lat.