algebra
architect
architecture
blackboard
board
builder
building
business
chalk
cheerful
construction
contractor
education
engineer
engineering
equation
finger
foreman
formula
gesture
hand
hardhat
helmet
idea
industry
male
man
math
mathematics
occupation
person
pointing
positive
problem
professional
project
protection
safety
science
scientific
showing
solution
solving
study
symbol
theory
thinking
up
white
young
定額
Cheerful positive thinking young man engineer wearing protective helmet showing index finger pointed up showing chalk written mathematics formulas and equations over blackboard. Education concept.の素材 [FY310116321830]
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