![](http://www.alamy.com/thumbs/6/F7B7EFE0-0E69-484B-9520-4CE0DED1350C/DN3AJF.jpg)
School board with formulas 2+2
School board with formulas 2+2
Size: 4113px × 5000px
Location: Russian Federation
Photo credit: © YuriV / Alamy / Afripics
License: Royalty Free
Model Released: No
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