abc
algebra
background
black
blackboard
board
calculate
calculation
chalk
chalkboard
class
classroom
college
complex
complicated
concept
draw
drawing
education
equation
exam
formation
formula
institute
intelligent
knowledge
learn
lecture
lesson
math
mathematical
mathematics
number
plus
school
science
sign
solution
study
studying
symbol
teach
teacher
text
theory
university
white
word
write
written
定額
mathematics lesson on blackboard or chalkboard. written in white chalkの素材 [FY31050657729]
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