Subtract $2 p - 2 q + 2 p q$ from $7 p - 8 q - p q$ .

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Solution

$(7 p - 8 q - p q) - (2 p - 2 q + 2 p q)$
$\Rightarrow (7 p - 2 p) + (- 8 q + 2 q) + (- p q - 2 p q)$
$∴ 5 p - 6 q - 3 p q$

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