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a = b + 2
a + b = 3b + 5 ; b necesariamente es menor puesto que a le excede en 2 unidades
Sustituyendo a = b + 2 en la 2da ecuación
b + 2 + b = 3b + 5
2b + 2 = 3b + 5
3b - 2b = 2 - 5
b = -3
a = (-3) + 2
a = -1