Subtract
$a (b - 5)$ from $b (5 - a)$

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Solution

The first term is $a (b - 5)$
The second term is $b (5 - a)$
Subracting $a (b - 5)$ from $b (5 - a)$ gives $b (5 - a) - a (b - 5) = 5 b - a b - a b + 5 a = 5 (a + b) - 2 a b$

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