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