algebra
backdrop
background
blackboard
board
calculus
classroom
college
complex
cube
drawing
education
formula
geometry
illustration
line
math
mathematics
minus
pattern
plus
problem
proof
pyramid
sample
school
science
scribble
seamless
side
sign
slate
solution
students
symbol
teacher
triangle
trigonometry
white
定額
Maths formulas written by white chalk on the blackboard background.の素材 [FY31045241881]
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