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If A=[{:(1,5),(7,12):}] and B = [{:(9,1)...

If `A=[{:(1,5),(7,12):}]` and `B = [{:(9,1),(7,8):}]`, find a matrix C such that 3 A + 5B + 2C is a null matrix.

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The correct Answer is:
`[{:(-24, -10),(-28,-38):}]`
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