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close up of math formulas on a blackboard

Stock Photo:
Image ID: 116212174
Release Information: N/A
Copyright: Picsfive
500x337 6.9"x4.7" (72dpi) 239 KB
1000x674 3.3"x2.2" (300dpi) 933 KB
6505x4386 21.7"x14.6" (300dpi) 31.3 MB
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