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x = 1,4,7
5+8+4+x = 17 + x
x = 1,4,7
x+9+7+6 = 22+x
x = 2,5,8
7+1+5+8+x = 21+x
x = 6
245_9 termina en número impar así que no se puede dividir entre 2
x+6+5+2 = 13+x
x = 2,5,8