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a + b = 74 a= 74 - b
a-b = 3 b + 4
74 - b - b = 3 b +4
74 - 2b = 3 b + 4
74 -4 = 3 b + 2 b
70 = 5b
70/5 =b
14 =b
a = 74 - b = 74 - 14 = 60
Respuesta El número menor es 14