subtract the sum of 6a - 6c + 3b and 7c - 4b + 13a from the sum of 2a - 7 + 4b and 6a - 4c - 4b
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=(2a-7+4b+6a-4c-4b)-(6a-6c+3b+7c-4b+13a)
=(8a-4c-7)-(19a-b+c) =8a-4c-7-19a+b-c =-11a+b-5c-7
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