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a + b = 12
3b = 2a + 1 (Donde b < a)
EN LA PRIMERA ECUACIÓN MULTIPLICAMOS POR 2.
2a + 2b = 24
2a + 1 = 3b
RESTAMOS AMBAS ECUACIONES:
2b - 1 = 24 - 3b
2b + 3b = 24 + 1
5b = 25
b = 5
a = 7
ESO ES TODO, SALUDOS...................