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Ob= 2 ⋅ 4x + 2 ⋅ 5x
378 = 8x + 10 x
378 = 18x / :18
x= 21 cm
szerokośc - 21 cm ⋅ 4 = 84 cm
18x=378cm
x=21cm
21*4=84cm
Odp. Szerokość wynosi 84cm.