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número menor x-1
número mayor x+1
x-1+x-12=x+1
x+x-x=1+1+12
x=14
los números son 13,14 y 15
x+x+1 - (x+2) = 12
2x +1 -x-2 = 12
x -1 = 12
x = 13 = menor
x+1 = medio
13+1
14
mayor
x+2
13+2
15
la suma seria
13+14+15
42