Respuesta:
x=20
Explicación paso a paso:
(7+9)/2=16/2=8
(12+4)/2=16/2=8
(9+31)/2=40/2=20
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Respuesta:
x=20
Explicación paso a paso:
(7+9)/2=16/2=8
(12+4)/2=16/2=8
(9+31)/2=40/2=20
x=20