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maths and science formula on chalkboard in classroom

Stock Photo:
Image ID: 91777337
Release Information: N/A
Copyright: MR.LIGHTMAN
500x433 6.9"x6.0" (72dpi) 240 KB
1000x866 3.3"x2.9" (300dpi) 922 KB
4874x4222 16.2"x14.1" (300dpi) 10.9 MB
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