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close up of math formulas on a blackboard

Stock Photo:
Image ID: 113762218
Copyright:
Small
500x358 6.9"x5.0" (72dpi) 225 KB
Med
1000x715 3.3"x2.4" (300dpi) 831 KB
Large
6336x4530 21.1"x15.1" (300dpi) 25.8 MB
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