algebra
background
blackboard
board
calculate
chalk
chalkboard
class
classroom
college
complex
complicated
concept
drawing
education
equation
exam
formula
graph
green
hand
high
intelligent
knowledge
learn
lecture
lesson
line
math
mathematical
mathematics
number
pattern
physics
plus
problem
school
science
sign
solution
study
studying
symbol
teach
teacher
theory
trigonometry
university
white
write
定額
Hand show business plan on chalkboardの素材 [FY31011425081]
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