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CF = 3
FB = 7
Perbandingannya:
8*7 = 3x
56= 3 x
x = 56 : 3
= 18, 67
3/7 = 8/EF
3 EF = 7 × 8
3 EF = 56
EF = 56/3
EF = 18 2/3