6a-5b + 3C + (-7a -3b-4 c) +3 a + 16b -7 c
6a-5b + 3C -7a -3b-4 c + 3 a + 16b -7 c
6a - 7a+ 3a -5b - 3b + 16b + 3c -4c - 7c
2a + 8b - 8c
Hope it helps you.........
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