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original problem:

(m-24+9)-(3m-7n-12)

distribute the negative sign:

(m-24+9)+(-3m+7n+12)

collect like terms:

-2m+7n-3

that is as far as you can simplify this problem without knowing the values of m and n

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Q: Subtract 3m-7n-12 from m -24 plus 9?
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