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A + B =(A - B)/5
2 ecuaciones, 2 incógnitas
A = 12 + B (sust en 2.)
12 + B + B = (12 + B - B)/5
12 + 2B = 12/5
60 + 10B = 12
10B = 12-60
B = -24/5 ; A = 12 + (-24/5)
A = 36/5
Respuesta: Menor número -24/5