ADD-. 3a-4b+4c,2a+3b-8c,a-6b+c
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6
Step-by-step explanation:
3a-4b+4c+2a+3b-8c+a-6b+c
3a+2a+a+3b-4b-6b+4c-8c+c
6a-1b-6b-4c+c
6a+7b-3c
I hope my answer is right
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