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posted by Josh on Tuesday, July 24, 2012 at 12:08am.
1/9 - (k+3)/(72K) = 1/(9k) - (k-1)/(8k)
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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