back
black
board
brain
brainstorm
business
businessman
calculation
career
chalk
chalkboard
complex
concept
confusion
creative
difficult
education
equation
exam
formula
front
goal
idea
job
knowledge
learn
lesson
man
math
mathematics
memory
mind
physics
professor
purpose
puzzled
question
school
science
sketch
smart
solution
student
success
teacher
thinking
thoughtful
thoughts
time
定額
Rear view of a puzzled businessman in front of a huge blackboard try to solve hard mathematics calculation, formula and equations. Thinking of project ideas and business planning concept.の素材 [FY310100107716]
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