![](http://www.alamy.com/thumbs/6/454CCA3F-334B-4EA8-A3E7-75B472ED1EB8/R0C40B.jpg)
Hand changing the word Unsolved into Solved with red marker isolated on white in solution concept.
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Photo credit: © Ivelin Radkov / Alamy / Afripics
License: Royalty Free
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