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x - wiek Agnieszki x - 1 - wiek Agnieszki
x + 5 - wiek Basi x + 5 - 1 - wiek Basi
x+5-1 = 2(x-1)
x+5-1 = 2x - 2
x - 2x = -2 - 5 + 1
-x = -6/:(-1)
x = 6
Odp: Agnieszka ma 6 lat.