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equations on blackboard.
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JPG 300 DPI
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Author:
dreamstime
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buy for Personal Use & Commercial
File Type:
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background
blackboard
board
calculate
chalk
chalkboard
concept
diagram
dirty
drawing
education
equations
exam
formula
graphic
handwriting
illustration
knowledge
learn
lecture
lesson
line
math
mathematical
mathematics
number
old
physics
school
science
scratch
sign
sketch
solution
study
studying
symbol
teach
texture
theory
used
write