algebra
background
black
blackboard
board
calculate
calculation
chalk
chalkboard
class
classroom
college
complex
complicated
concept
drawing
education
equation
exam
formula
handwriting
knowledge
learn
lesson
math
mathematic
mathematical
mathematics
number
physics
plus
problem
school
science
sign
solution
student
study
symbol
teach
theory
trigonometry
university
white
write
定額
Mathematical operations and algebra mathematic formulas written with chalk on the blackboardの素材 [FY310234621972]
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