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Question
Simplify.
`sqrt 7 - 3/5 sqrt 7 + 2 sqrt 7`
Solution
`sqrt 7 - 3/5 sqrt 7 + 2 sqrt 7`
`=(1-3/5+2)sqrt7`
`=(3-3/5)sqrt7`
`=((15-3)/5)sqrt7`
`= 12/5 sqrt 7`
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