What should be added to -9/11 to get 1/15?
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A clock is a device used to measure, keep, and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, and the year. ... Water clocks, along with the sundials, are possibly the oldest time-measuring instruments.
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Step-by-step explanation:
-9/11 + X=1/15
-9/11-1/15= X
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