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p = l + 7 (l bace el = lebar)
K = 2 (p+l)
74 = 2 (l+7+l)
74/2 = 2l + 7
37 = 2l + 7
2l = 37-7
l = 30/2
l = 15 cm
2((l+7)+l)=74
2(2l+7)=74
4l+14=74
4l=74-14
l=60/4
l=15