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a = 8
b = 10
c = 12
a+b = 18
4+5 = 18
*4+5 = 9 supaya 9 bisa menjadi 18 maka masing-masing dikali 2
c-a = 4
6-4 = 4
*6-4 = 2 supaya 2 bisa menjadi 4 maka masing-masing dikali 2
a : b : c = 4 : 5 : 6 (semua dikali 2)
8 : 10 : 12