"To decode the text "wnphmmv" using rot-13, we need to replace each letter with the letter that is 13 positions later in the alphabet. This can be done manually by writing out the alphabet and finding the corresponding letters for each one in the encoded text.

For example, the first letter in the encoded text is "w", which corresponds to the letter "h" in the alphabet. The second letter is "n", which corresponds to the letter "a". This process can be repeated for each letter in the encoded text to get the decoded text.

Here is the full decoding process for "wnphmmv" using rot-13:

w => h n => a p => l h => o m => e m => e v => i

The decoded text is "hello"."