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2x ->>> wiek Mateusza obecnie
x + 5 ->>> wiek Zosi za 5 lat
2x + 5 ->>> wiek Mateusza za 5 lat
x + 5 + 2x + 5 = 40
3x + 10 = 40
3x = 40 - 10
3x = 30 //:3
x = 10
odp. Zosia ma 10 lat a Mateusz 20 lat.