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

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Solution

We have to subtract $a (b - 5)$ from $b (5 - a)$ :
$b (5 - a) - a (b - 5) = 5 b - ab - (ab - 5 a) = 5 b - ab - ab + 5 a = 5 a + 5 b - 2 ab$
Therefore, the required answer is $5 a + 5 b - 2 ab$ .

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