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x+2,4 - druga listewka
x+x+2,4=9
2x=6,6
x=3,3 - pierwsza
3,3+2,4=5,7-druga
2x = 6,6 / :2
x = 3,3
3,3 + 2,4 = 5,7
odp. Krótsza ma 3,3m, a dłuższa 5,7m.