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Aquí solo debes reemplazar:
y=3x; z=3Y---> z=3(3x)=9x
x+y+z=39--> x+3x+9x=39--> 13x=39--> x=39/13 =x; x=3
y=3x--> y=3(3)=9; y=9
z=3y--> z=3(9)=27; z=27