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▶Primero multiplicacion y division, después suma y resta.
▶2{4[7+4(5.3-9)]-3.(40-8)}=
▶2{4[7+4(15-9)]-3.(32)}=
▶2{4[7+4.6]-3.32}=
▶2{4[7+24]-96}=
▶2{4.[31]-96}=
▶2{4.31-96}=
▶2{124-96}=
▶2{28}=
▶56
Resultado final: 56
Saludos.