[tex]\text{\textbf{Respuesta:} El resultado es $-15$.}[/tex]
[tex]\text{\textbf{Procedimiento:} }[/tex]
[tex]18+3\{-4+[-15+20+(-3)]+(-9)\}\\\\=18+3\{-4+[-15+20-3]+(-9)\}\\\\=18+3\{-4+[2]+(-9)\}\\\\=18+3\{-4+2-9\}\\\\=18+3\{-11\}\\\\=18-33\\\\=-15[/tex]
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[tex]\text{\textbf{Respuesta:} El resultado es $-15$.}[/tex]
[tex]\text{\textbf{Procedimiento:} }[/tex]
[tex]18+3\{-4+[-15+20+(-3)]+(-9)\}\\\\=18+3\{-4+[-15+20-3]+(-9)\}\\\\=18+3\{-4+[2]+(-9)\}\\\\=18+3\{-4+2-9\}\\\\=18+3\{-11\}\\\\=18-33\\\\=-15[/tex]