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close up of math formulas on a blackboard

Stock Photo:
Image ID: 111802316
Copyright:
Small
500x359 6.9"x5.0" (72dpi) 228 KB
Med
1000x718 3.3"x2.4" (300dpi) 838 KB
Large
6488x4657 21.6"x15.5" (300dpi) 26.9 MB
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