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p = 7x
l = 5x
2(p + l) = K
2(7x + 5x) = 1.440
7x + 5x = 720
12x = 720
x = 60
p = 7x
= 7(60)
= 420
l = 5x
= 5(60)
= 300
L = p × l
= 420 × 300
= 126.000 cm²