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a= 2b-2
2b-2+2b-2 +2b= 26m
6b=30m/6
b=5m
a=10-2
a=8
Wymiary 8 na 5
2 * (x + 2x - 2) = 26
6x - 4 = 26 / +4
6x = 30 / :6
x = 5
szerokość = 5m
długość = 2 * 5m - 2m = 8m