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close up of math formulas on a blackboard

Stock Photo:
Image ID: 76358803
Copyright:
Small
500x372 6.9"x5.2" (72dpi) 235 KB
Med
1000x744 3.3"x2.5" (300dpi) 882 KB
Large
5068x3769 16.9"x12.6" (300dpi) 14.8 MB
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