Dirty grunge chalkboard full of mathematical problems and formula

Credit:: francescoch

Item number:: 898683510
Collection:: iStock
Release info:: No release required

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	Web	509 x 339 px \| 17.96 x 11.96 cm \| 72 dpi
	Low	727 x 484 px \| 25.65 x 17.07 cm \| 72 dpi
	Medium	2125 x 1416 px \| 17.99 x 11.99 cm \| 300 dpi
	High	3869 x 2579 px \| 32.76 x 21.84 cm \| 300 dpi
	Very high	5472 x 3648 px \| 46.33 x 30.89 cm \| 300 dpi

Dirty grunge chalkboard full of mathematical problems and formula

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