algebra
background
black
blackboard
board
calculate
chalk
chalkboard
class
classroom
college
complex
complicated
concept
dirty
drawing
equation
exam
formula
high
illustration
knowledge
learn
lecture
lesson
line
math
mathematical
mathematics
number
pattern
physics
problem
school
science
sign
study
studying
teacher
university
write
定額
Math text with some maths formulas on chalkboardの素材 [FY31045241568]
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