line chalkboard with function mathematical icon isolated white background school blackboard sign colorful outline |
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| navigate by keyword : art back background banner billboard black blackboard blank board business chalk chalkboard class classroom color colorful concept contour copy design dirty education empty flat frame function graphic green icon illustration isolated lesson line linear lineart mathematics object old outline retro school sign space study symbol template vector wood wooden write |
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| Line Chalkboard with function mathematical icon isolated on white background. School Blackboard sign. Colorful outline concept. Vector. |
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