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1440 = 2(7x+5x)
1440/2 = 7x+5x
720 = 12x
x = 720/12
x = 60
panjang = 7x = 7 x 60 = 420 m
lebar = 5x = 5 x 60 = 300 m
luas = p x l
luas = 420 x 300
luas = 126.000 m²