Add
$7 a b, - 4 a b, - a b$

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Solution

The given pairs of terms $7 a b, - 4 a b a n d - 3 a b$ are like terms.
So, adding the numerical coefficient of each term.
The sum
$= 7 a b + (- 4 a b) + (- a b) = 7 a b - 4 a b - a b = 7 a b - 5 a b = 2 a b$

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