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smart teacher writing various high school maths and science formula with light bulb ( symbol of idea and solution )

Stock Photo:
Image ID: 107222435
Release Information: Signed model release filed with Shutterstock, Inc
500x468 6.9"x6.5" (72dpi) 175 KB
1000x936 3.3"x3.1" (300dpi) 517 KB
4058x3800 13.5"x12.7" (300dpi) 4.0 MB
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