adult
algebra
background
black
blackboard
board
book
caucasian
chalk
chalkboard
class
classroom
college
education
elementary
equation
exam
female
formula
girl
green
happy
high
intelligent
knowledge
learn
learning
lesson
math
mathematic
people
person
physics
portrait
school
science
smart
smile
standing
student
study
teach
teacher
tutor
university
white
woman
writing
young
定額
young woman writing mathematical equations on the blackboard in classroom, learnの素材 [FY310198844174]
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