If your lost password is in the keychain you can get 'Keychain Access' to show it to you.
Applications/Utilities/Kychain Access
Open this app. and then see if the password is listed there.
If it is, you can double click on it and tick the box labeled 'show password' down the bottom of the window that pops up. Just enter your admin password and it will show you the password for that keychain.
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