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lebar tanah: x-8
keliling: 64
2(panjang tanah) + 2(lebar tanah) = 64
2x + 2(x-8) = 64
2x + 2x - 16 = 64
4x = 80
x = 20
jadi, pajang tanah: 20m dan lebar tanah: 20-8 = 12m
jadi, luas tanah= 20 × 12 = 240m persegi