Respuesta:
12 = x -7
12 + 7 = x - 7 + 7
19 = x
Verificación:
12 = 19 - 7
12 = 12
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Respuesta:
12 = x -7
12 + 7 = x - 7 + 7
19 = x
Verificación:
12 = 19 - 7
12 = 12