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math simple equation
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add
addition
answer
arithmetic
background
basic
black
blackboard
board
calculate
chalk
chalkboard
class
classroom
clean
correct
dirty
drawing
easy
education
elementary
equals
equation
error
false
four
green
handwriting
incorrect
learn
learning
lesson
math
mathematical
mathematics
number
numbers
one
plus
primary
problems
school
simple
smart
smudge
smudged
solution
struggle
study
stupid
success
sum
symbol
teach
teacher
two
wipe
wood
write
wrong