Why is there a 5 when you pull out the 2?

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There probably is a 5 inside the factoring that you missed. Check the original again and see if it has a factor of 5. For a more complete answer, please be specific for your question. The rest of us have no idea what problem you are asking about, so if you wish for example to ask why 10 has a 5 in it after you pull out a 2, then specify it in your question