#901765024 Formulas and equations written on blackboard.

Formulas and equations written on blackboard.
Picture ID: 901765024
Picture URL: https://cutcaster.com/photo/901765024-Formulas-and-equations-written-on-blackboard/
Description: Blackboard chalk painted with formulas, equations and school tools.
Contributor: Borys Shevchuk

 

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