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x=menor
x+1=numero medio
x+2=numero mayor
entonces:
3x + x+1 = x+2
4 3
3(3x)+4(x+1) = x+2
(4)(3)
9x+4x+4 = x+2
12
9x+4x+4=12(x+2)
13x+4=12x+24
13x-12x=24-4
x=20
el numero menor es el 20