15+7-7-9+54-7=
22-7-9+54-7=
15-9+54-7=
6+54-7=
60-7=
53
22-7-9+54-7=
15-9+54-7=
6+54-7=
60-7=
53
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Respuesta:
Explicación paso a paso:
15+7-7-9+54-7= 53
22-7-9+54-7= 53
15-9+54-7= 53
6+54-7= 53
60-7= 53
53= 53