Subtract $4 a - 7 a b + 3 b + 12$ from $12 a - 9 a b + 5 b - 3$

8 a - 2 a b + 2 b - 15

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a - a b + 2 b - 25

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a - 2 a b + 2 b - 5

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8 a - a b + 2 b - 10

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Solution

The correct option is A $8 a - 2 a b + 2 b - 15$
Rearranging the terms of the given expressions, changing the sign of each term of the expression to be subtracted and adding the two expressions, we get.
$12 a - 9 a b + 5 b - 3$
$4 a - 7 a b + 3 b + 12$
$-$ $+$ $-$ $-$
------------------------------
$8 a - 2 a b + 2 b - 15$
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