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  • $\begingroup$ Thank you so much for your answer. However i still need all solutions. And this method, even though it returned some solutions, as you can see, the solution that FindRoot found is not between them. Do you know why this might be? $\endgroup$ Commented 2 days ago
  • $\begingroup$ @CaptainParsifal I just used 3 as example. It seems max it can find is 4. will update answer. I do not know why it can't find the one you found using FindRoot. It seems just limitation of NSolve. Or look at other solution given. $\endgroup$ Commented yesterday