well... thanks to Ber, I've spent the past 30 minutes solving math problems for lazy students on Yahoo! Answers... then I stumbled on this post (which is a little to crude to post here):
http://answers.yahoo.com/question/index;_ylt=AkMUQ6EABBjyq85U_FxrVGPzy6IX?qid=1006033107287
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