teenager hand with chalk writes simple mathematical example green blackboard |
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| navigate by keyword : add advertising answer arithmetic background banner billboard blackboard blank board calculate chalk chalkboard child childhood class classroom concept copy dirty drawing easy educate education elementary empty equation frame green hand learning lesson math mathematic mathematical number one painting plus school simple space student study surface task teach teenager text texture training two wood write writes |
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| A teenager's hand with chalk writes a simple mathematical example on a green blackboard. The concept of education and training |
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