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Stock Photo - teacher hand writing various high school maths and science formula with light bulb symbol of idea and solution

teacher hand writing various high school maths and science formula with light bulb   symbol of idea and solution Stock Photo - 15659235
teacher hand writing various high school maths and science formula with light bulb symbol of idea and solution
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Image ID : 15659235
Image Type : Stock Photo
Copyright : Dusit Panyakhom