Add:
$8 a b, - 5 a b, 3 a b, - a b$

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Solution

The terms of the given expressions (in the same order) must be written in the form of rows with like terms below each other and adding column-wise, we get:
$8 a b - 5 a b 3 a b + - a b - ------- - 5 a b$
Therefore, the sum is $5 a b$ .

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