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80 = 2 (x+6+x)
80 = 2 (2x+6)
80/2 = 2x+6
40 = 2x+6
40-6 = 2x
34 = 2x
x = 34/2
x = 17
p = x+6
p = 17+6
p = 23 m
l = x
l = 17 m
L = p x l
L = 23 x 17
L = 391 m²