\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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\(\{5, 6, 7\} \cup \{\} =\)
\(\{5, 6, 7, \{\}\}\)
\(\{\}\)
\(\{5, 7\}\)
\(\{5, 6\}\)
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