Add: $3 a - 4 b + 4 c, 2 a + 3 b - 8 c, a - 6 b + c$ .

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Solution

$(3 a - 4 b + 4 c) + (2 a + 3 b - 8 c) + (a - 6 b + c) = 3 a - 4 b + 4 c + 2 a + 3 b - 8 c + a - 6 b + c = (3 a + 2 a + a) + (- 4 b + 3 b - 6 b) + (4 c - 8 c + c) (C o m b i n i n g l i k e t e r m s) = (3 + 2 + 1) a + (- 4 + 3 - 6) b + (4 - 8 + 1) c = 6 a - 7 b - 3 c$
Hence, $(3 a - 4 b + 4 c) + (2 a + 3 b - 8 c) + (a - 6 b + c) = 6 a - 7 b - 3 c$ .

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