mat formula on the chalkboard
Schlüsselwörter
algebra,
background,
black,
blackboard,
board,
chalk,
classroom,
college,
complex,
difficult,
drawing,
education,
exam,
formula,
geometry,
handwriting,
incomprehensible,
line,
mathematic,
mathematic,
problem,
research,
sample,
school,
science,
signs,
solution,
student,
study,
symbol,
teacher,
teaching,
test,
white
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