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8a-6b+6c
-4(3a+2b-c)
-12a-8b+4c
2(4a-3b+3c)+[-4(3a+2b-c)]
8a-6b+6c+(-12a-8b+4c)
8a-6b+6c-12a-8b+4c
-4a-14b+10c