Jawabanmu

2016-08-18T14:17:57+07:00
8 / 18 = 12 / 12 + X
8 (12+X) = 18 . 12
96 + 8X = 216
8X = 216 - 96
X = 120/8 
.   = 15

ca = cd + da
.... =12 + 15
.... = 27

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