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-(-)= + ; +(-)=- ; +(+)=+
{ [ ( -42 ) + (-6) ]:(-8):(-3) + [ 15:(-5) ]²
↓ ↓ ↓ ↓
{ [ -42 -6 ]:(-8):(-3) + [ -3 ]²
↓ ↓
{ [ -48 ]:(-8):(-3) + [ (-3)(-3) ]
↓
{ [ -48 ]:(-8):(-3) + [ + 9 ]
↓
{ [ -48 ]:(-8):(-3) +9
resumiendo
∴(-48)÷(-8) ÷(-3) +9
↓ ↓ ↓
(+6) ÷(-3) +9
↓ ↓
-2 + 9=
↓
+7 respuesta