blackboard
board
brainstorm
calculate
college
complex
complicated
concept
difficult
economics
educate
education
educational
equation
exam
figure
formula
geometry
hands
head
hold
homework
knowledge
learn
lesson
man
math
mathematical
mathematics
matrix
night
numbers
physics
problem
school
science
sigma
solution
solve
student
study
symbol
test
theory
think
university
white
whiteboard
worried
young
定額
Student holding his head looking at complex math formulas on whiteboard. Mathematics and science exam concept, problem to solve. Real equations, symbols.の素材 [FY31050883348]
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