Simplify:
(iv) $5 a b + 2 a b - 6 a b + a b$

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Solution

Simplifying the given expression, we get,

$5 a b + 2 a b - 6 a b + a b = a b (5 + 2 - 6 + 1)$

$= a b (7 - 5)$

$= 2 a b$

Hence, $5 a b + 2 a b - 6 a b + a b = 2 a b$

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