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math physics formulas on balck chalkboard

Stock Photo:
Image ID: 113151091
Release Information: N/A
Copyright: gonin
500x350 6.9"x4.9" (72dpi) 113 KB
1000x700 3.3"x2.3" (300dpi) 425 KB
6370x4460 21.2"x14.9" (300dpi) 16.0 MB
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