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9n 7 8 4k use k 2 and n 3

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9n + 7(-8 + 4k) use k=2 and n=3

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Answer to a math question 9n + 7(-8 + 4k) use k=2 and n=3

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9\times3+7\times\left(-8+4\times2\right)

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9n + 7(-8 + 4k) use k=2 and n=3

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