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a/c = 5/7 → 7a = 5c
c = (1/2)(a+b) → 7a/5 = (1/2)(a+b)
elilimasi b:
5a - b = 24
-9a/5 + b = 0 (+)
16a/5 = 24
a = (5/16).24
a = 15/2 ; maka c = (7/5).7,5
c = 10,5 dan b = 37,5 - 24
b = 13,5