algebra
background
board
calculus
casual
class
classroom
college
complex
copy space
division
drawing
education
equation
exam
explain
formula
graduate school
happy
high school
learn
lesson
marker
math
mathematics
number
old
problem
professional
pupil
record
remote
school
scratch
solution
solving
space
student
study
teacher
text
university
white
white board
whiteboard
work
worker
write
young
定額
teacher's hand makes notes on the white school board. education. the beginning of the school yearの素材 [FY310206648997]
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