Evaluate:
(iii) $- 8 a - 3 a + 12 a + 13 a - 6 a$ .

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Solution

Simplifying the given expression, we get,

$- 8 a - 3 a + 12 a + 13 a - 6 a = a (- 8 - 3 + 12 + 13 - 6)$

$= a (- 8 - 3 - 6 + 12 + 13)$

$= a (- 17 + 25)$
$= 8 a$
Hence, $- 8 a - 3 a + 12 a + 13 a - 6 a = 8 a$ .

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