Respuesta:
9×-1=107-3×
9×+3×=107 + 1
12× = 108
×= 108/12
× = 9
comprobamos
9× - 1 = 107 - 3×
9(9)-1=107-3(9)
81-1=107-24
80 = 80
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Respuesta:
9×-1=107-3×
9×+3×=107 + 1
12× = 108
×= 108/12
× = 9
comprobamos
9× - 1 = 107 - 3×
9(9)-1=107-3(9)
81-1=107-24
80 = 80