Respuesta :

[tex]\bf \underset{\textit{\Large 7+2 = 9}}{\boxed{-7}\stackrel{\textit{7 units}}{\rule[0.35em]{15em}{0.25pt}}0\stackrel{\textit{2 units}}{\rule[0.35em]{8em}{0.25pt}}\boxed{2}}[/tex]

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