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428 |2
214 |2
107 |107
Los divisores son 1, 2, 4, 107, 214 y 428
A 1, 2, 4 no le puedes restar 9, pero a 107-9 = 98, 214-9 = 205 y 428-9 = 419
Conjunto solución { 98, 205, 419}
Ya que 9 + 98 = 107 y 428/107 =4
9 + 205 =214 y 428/214 = 2
9 + 419 = 428 y 428/428 = 1