Add the following like terms
$- 15 p q, 12 q p, - 23 p q$ and $7 p q$

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Solution

According to question,

$- 15 p q, 12 p q, - 23 p q, 7 p q$

Adding terms,
$- 15 p + 12 p q - 23 p q + 7 p q$
$- 19 p q$

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