blackboard
business
businessman
calculations
clueless
complex
complicated
concept
confused
confusion
difficult
education
equation
exam
formula
head
idea
job
knowledge
learn
lesson
man
math
mathematics
memory
mind
numbers
problem
professor
puzzled
question
quiz
science
scratching
sketch
smart
solutions
some
sophisticated
student
success
symbol
teacher
theory
thinking
thoughtful
thoughts
unsure
wondering
定額
Clueless and pensive businessman scratching his head thinking for solutions on solving difficult calculations. Puzzled male looks confused in front of a blackboard with sophisticated equationsの素材 [FY310181996917]
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