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book caucasian chalk class classroom college discussing education equation exam explain explaining explanation eyeglasses friendly glasses happiness hispanic knowledge lecture lesson male man math mathematics people person professional professor school standing student study teach teacher tie tutor university white woman work writing young2016.01.17 Business School Training In The Samara State University. People And Education. Teacher Writing On Math Editorial Photo
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2016.01.17 Business school training in the Samara State University. People and education. Teacher writing on math #175229229
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2016.01.17 Business school training in the Samara State University. People and education. Teacher writing on math equation on blackboard during lesson..
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