Рука пишет шалком на доске формулы и графики, понятия учебы, школы, образования, экзаменов, тестов, - Стоковое фото и изображение

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Hand drawing mathematical formulas on a board

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Math background, geometric equations, formulas and graphs written in chalk on a blackboard

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Hand with chalk draws on the blackboard formulas and elements, signs and symbols of chemistry, the concept of the study of substances, organic chemistry

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