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equation shapes - mathematical symbols sketched with thick white chalk lines on blackboard with eraser smudges

Stock Photo:
Image ID: 37897549
Copyright:
Small
371x500 5.2"x6.9" (72dpi) 175 KB
Med
742x1000 2.5"x3.3" (300dpi) 740 KB
Large
2226x3000 7.4"x10.0" (300dpi) 4.1 MB
Super
4452x6000 14.8"x20.0" (300dpi) approx.16.9 MB
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