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Old chalkboard with hard math equations

Stock Photo:
Image ID: 16292587
Copyright:
Small
345x500 4.8"x6.9" (72dpi) 209 KB
Med
689x1000 2.3"x3.3" (300dpi) 810 KB
Large
2688x3900 9.0"x13.0" (300dpi) 7.6 MB
Super
5376x7800 17.9"x26.0" (300dpi) approx.29.8 MB
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