17=x+y/2+z/217=x/3+y+z/317=x/4+y/4+z
34=2x + y+ z51= x +3y+ z68= x + y+4z
2+3-12-3
85 =3y +4z17=-2y+3z (*3/2) => 51/2=-3y+9/2z
221/2=17/2z => z=13
y=(85-4*13)/3=11x=17-11/2-13/2=5
5, 11, 13
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