Subtract: 5-a-4b+4c from 5a-7b+2c
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(5-a-4b+4c)-(5a-7b+2c)
5-a-4b+4c-5a+7b-2c
5-a-5a-4b+7b+4c-2c
5-6a+3b+2c
5-a-4b+4c-5a+7b-2c
5-a-5a-4b+7b+4c-2c
5-6a+3b+2c
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