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What number should be subtracted from 3/...

What number should be subtracted from `3/7` to get `5/4?`

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The difference of two numbers is `5/4`.
One of the numbers is `3/7`.
Let the other number subtracted be `x` to get `5/4`.
Now,
`3/7-x=5/4`
`-x=5/4-3/7`
Taking LCM, we get the LCM as `28`.
`-x=(35-12)/28`
`-x=23/28`
`x=-23/28`.
Hence, the other number is `-25/28`.
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