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panjang karton = 20 + (2 + 2) = 20 + 4 = 24 cm
tinggi foto = 30 cm
tinggi karton = 30 + (x + 2) = 32 + x cm
20 / 24 = 30 / (32 + x)
720 = 640 + 20x
20x = 720 - 640
20x = 80
x = 80 / 20
x = 4 cm