I've flagged this post with the 'other' option for flags, and described it as 'Homework question'. The post was closed as a homework question, and my flag was declined. The justification was that I did not use a standard flag, and was referred to What is flagging?. In this page it is not specified which flag I should have used, and since Homework questions must be one of the most important types of flags my question is twofold: why is there no explicit explanation in that page on what to do in 'solve my homework' type of questions? What flag should I have used?