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The short and generic answer is yes, it will lower the strength you're receiving from that site but it won't drop it to 1/20th. More links is a good thing if those links make sense but the more you have, the less strength each of them carries; 20 links will not offer 20x the strength of 1 link, if that makes sense

There is a first rate post on this subject here that could explain this far better than most of us could. https://moz.com/learn/seo/page-authority Hope this helps. Andy