6a+2b-c,2a-b+3c,-a+2b-4c,-12a-b-3c
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Step-by-step explanation:
(6a+2b-c) + (2a-b+3c) + (-a+2b-4c) + (-12a-b-3c)
6a+2b-c+2a-b+3c-a+2b-4c-12a-b-3c
6a+2a-a-12a+2b-b+2b-b-c+3c-4c-3c
-5a+2b-5c
2b-5a-5c
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