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1/9 - (k+3)/(72K) = 1/(9k) - (k-1)/(8k)

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    1/9 - (k+3)/(72K) = 1/(9k) - (k-1)/(8k)
    multiply each term by 72k

    8k - (k+3) = 8 - 9(k-1)
    8k - k - 3 = 8 - 9k + 9
    16k = 20
    k = 20/16 = 5/4 or 1.25

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