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Physical and chemical formulas and graphs on a black school board
Related tags:
- calculus
- equation
- math formula
- trigonometry
- math class
- math teacher
- mathematics
- algebra
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- teacher board
- mathematical formula
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- blackboard
- writing board
- black bord
- chalkboard
- formula
- school blackboard
- school class
- teacher teaching
- chalk
- class
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- minus
- school exam
- school drawing
- mathematics numbers
- school education
- theory
- education
