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$8 a - 6 a b + 5 b, - 6 a - a b - 8 b, - 4 a + 2 a b$

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Solution

Given expressions are $8 a - 6 a b + 5 b, - 6 a - a b - 8 b, - 4 a + 2 a b$ .
Adding the given expressions by combining the like terms, we get:

$\begin{matrix} = 8 a - 6 a b + 5 b - 6 a - a b - 8 b - 4 a + 2 a b = 8 a - 6 a - 4 a - 6 a b - a b + 2 a b + 5 b - 8 b s o w e g e t, = - 2 a - 5 a b - 3 b \end{matrix}$

Hence, the sum of the given expressions is $- 2 a - 5 a b - 3 b$ .

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