-7+21/[+5-(-2)]×{-[-(-3)-2]}=
$ -7 +21/[+5-(-2)]×\{-[-(-3)-2]\}= $
$= -7+21/[5+2]×\{-[3-2]\} = $
$= -7+21/7×\{-1\}=$
$= -7+3×\{-1\} =$
$ = -7-3=$
$=-10$
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