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

Stock Photo:
Image ID: 114932791
Release Information: N/A
Copyright: Dusit
500x463 6.9"x6.4" (72dpi) 110 KB
1000x925 3.3"x3.1" (300dpi) 299 KB
4000x3700 13.3"x12.3" (300dpi) 2.1 MB
8000x7400 26.7"x24.7" (300dpi) approx.5.1 MB
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