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CA/CD = AB/DE
4 + x/4 = 12/9
48 = 36 + 9x
48-36 = 9x
12 = 9x
12/9 = x
1 3/9 = x
panjang AC = CD + x
= 4 + 1 3/9
= 5 3/9
= 5 ⅓