Berapa ya totalnya?

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a+a+a = 15 -> 3a =15 -> a=15:3 -> a = 5 b+b+b = 12 -> 3b=12 -> b=12:3 -> b = 4 c+c+c = 6 -> 3c=6 -> c=6:3 -> c = 2 a + b - c = 5 + 4 - 2 = 9 - 2 = 7

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