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= 2a + 3b + b + 4c - c = 2a + 4b + 3c
2. 2(2a+3b+4c) + 3(4a-3b-c) -c
= 4a+6b+8b + 12a-9b-3c -c
= 4a+12a+6b-9b+8c-3c-c
= 16a-3b+8c-4c
= 16a-3b+4c