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close up of math formulas on a blackboard

Stock Photo:
Image ID: 111802484
Copyright:
Small
500x308 6.9"x4.3" (72dpi) 144 KB
Med
1000x615 3.3"x2.0" (300dpi) 573 KB
Large
6989x4299 23.3"x14.3" (300dpi) 26.8 MB
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