(21) a + b : b + c : C+ = 4 : 7: 9 a: b : c=?
(31) 3:1:6
(a) 2 : 5:3
(H) 1:8 : 15
(G) 6 : 2 : 9
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(21) a + b : b + c : C+ = 4 : 7: 9 a: b : c=?
(31) 3:1:6
(a) 2 : 5:3
(H) 1:8 : 15
(G) 6 : 2 : 9
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