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3x+6=39
x=33/3
x=11
Aunque tiene que salir 12 porque es x+x+1+x+2=39 y luego despejas. Este es el planteamiento correcto.
X
X+1
X+2
x+x+1+x+2= 39
3x =39-1-2
3x = 36
x = 36/3 =12