subtract the sum of(6b-6c) and (-8b+6a+2c) from the sum of ((8b+2a) and (-4c-7a-c) and (9a+5c)
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➜ [ (8b+2a) + (-4c-7a-c) + (9a+5c) ] - [ (6b-6c) + (-8b+6a+2c) ]
➜ [ 8b + 2a - 4c -7a - c + 9a + 5c ] - [ 6b - 6c - 8b + 6a+ 2c ]
➜ [ 11a + 8b - 7c ] - [ 6a - 2b - 4c ]
➜ 11a + 8b - 7c - 6a + 2b + 4c
➜ 5a + 10b -3c
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