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3a7a = 7
3 * 10³ + a * 10² + 7 * 10 + a = 7
3000 + 100a + 70 + a = 7
3070 + 101a = 7
101a = 3070 - 7
101a = 3063
a = 3063/101
Respuesta.
3063/101