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blackboard with complicated math formulas

Stock Photo:
Image ID: 124147825
Release Information: N/A
Copyright: Humannet
Small
500x334 6.9"x4.6" (72dpi) 225 KB
Med
1000x667 3.3"x2.2" (300dpi) 801 KB
Large
3986x2657 13.3"x8.9" (300dpi) 6.3 MB
Super
7972x5314 26.6"x17.7" (300dpi) approx.20.5 MB
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