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x/3 + (x-1)/2 + (x+1)/4 = x+1........./*12
12/3x + 12/2(x-1) + 12/4(x+1) = 12(x+1)
4x+6(x-1)+3(x+1) = 12x+12
4x+6x-6+3x+3 = 12x+12
4x+6x+3x-12x = 12+6-3
X= 15
X-1= 15-1 = 14
X+1= 15+1 = 16
Solución: los números son 14, 15 y 16