[tex] \bf \{2[6+7(9)+3]\}4\implies \stackrel{\mathbb{PEMDAS}}{\{2[6+\stackrel{\downarrow }{63}+3]\}4}\implies \{2[\stackrel{\downarrow }{72}]\}4\\\\\\\{\stackrel{\downarrow }{142}\}4\implies 568 [/tex]
