Answer:
a = 12
Explanation:
a+b+c+a+c+b+a+c = 12+a+a+b+b+c+c+c
=> 3a + 2b + 3c = 12 + 2a + 2b + 3c
=> 3a - 2a + 2b - 2b + 3c - 3c = 12
=> a = 12
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