Add the followings: $3 a b, - 4 a b, 7 a b, - 5 a b$ .

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Solution

To find: $3 a b - 4 a b + 7 a b - 5 a b$
$= (3 - 4 + 7 - 5) a b$
$= (1) (a b)$
$= a b$

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