algebra
backdrop
background
blackboard
board
calculate
calculus
chalk
chalkboard
class
classroom
college
complex
concept
education
exam
formula
geometry
high
knowledge
learn
lecture
lesson
math
mathematical
mathematics
medicine
minus
number
pattern
physics
plus
problem
proof
school
science
scribble
sign
slate
solution
students
study
studying
symbol
teach
teacher
theory
trigonometry
university
write
定額
side view of math formulas and calculation written over chalkboard. selective focus.の素材 [FY31051154921]
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