User talk:2601:98B:8100:38F0:805C:AFA8:EB60:7BEE

Hello, I'm 2601:5CC:8301:FD00:501E:F2B5:AF3A:C27F. I noticed that you added or changed content in an article, Proportionality (mathematics), but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at the tutorial on citing sources, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. 2601:5CC:8301:FD00:501E:F2B5:AF3A:C27F (talk) 01:40, 2 October 2019 (UTC)
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