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16a - 4b + 12c + 5a - 2b + 9c
(16a + 5a) + (- 4b - 2b) + (12c + 9c)
21a + (- 6b) + 21c
21a - 6b + 21c
=16a+ 5a -4b -2b +12 c +9c
=21a-6b+21c