Tick $(✓)$ the correct answer in each of the following:
The sum of $(6 a + 4 b - c + 3), (2 b - 3 c + 4, (11 b - 7 a + 2 c - 1))$ and $(2 c - 5 a - 6)$ is

(a) $(4 a - 6 b + 2)$
(b) $(- 3 a + 14 b - 3 c + 2)$
(c) $(- 6 a + 17)$
(d) $(- 6 a + 6 b + c - 4)$

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Solution

Sum of $6 a + 4 b - c + 4 2 b - 3 c + 4 - 7 a + 11 b + 2 c - 1 - 5 a + 2 c - 6 - ----------------- - - 6 a + 17 b - ---------------- -$

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