A male teacher, with a dark beard and stylish blue-framed glasses, wearing a light green collared shirt and a brown v-neck sweater vest, is focused on writing math problems on a white board in a classroom. He holds a black marker in his right hand, actively writing numbers and operations such as "42 + 28 70", "33 + 15 48", "73 - 21 52", and "100 - 28 72". His expression is concentrated and professional, conveying dedication to teaching. In his left hand, he holds the marker's cap. The background features a blurred colorful bulletin board and hints of classroom furniture, establishing an authentic educational environment. This image is ideal for illustrating concepts related to education, mathematics, classroom learning, tutoring, academic support, and teaching professions.
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