Blackboard full of equations Stock Photo

Name	Bytes	Width	Height	DPI	Media Type
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medium	587633	1257	838	300	image/jpeg
large	1277362	2125	1416	300	image/jpeg
x_large	3089182	3870	2578	300	image/jpeg
xx_large	5759709	5620	3744	300	image/jpeg

istock Blackboard full of equations 154932300

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istock Blackboard full of equations 154926630

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