x=2+s+t ==> t= x-2-s
y=2+s+2t ==> s=y-2-2t ==>s=y-2-2*(x-2-s) ==>s=y-2-2x+4+2s ==>s=2x-y+2
z=3+2s+t ==> z=3+2*(2x-y+2)+x-2-s ==>z=3+4x-2y+4+x-2-(2x-y+2)
z = 3+4x-2y+4+x-2-2x+y-2
z= 3x -y -1 ==> 3x-y-z =1 Letra A
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x=2+s+t ==> t= x-2-s
y=2+s+2t ==> s=y-2-2t ==>s=y-2-2*(x-2-s) ==>s=y-2-2x+4+2s ==>s=2x-y+2
z=3+2s+t ==> z=3+2*(2x-y+2)+x-2-s ==>z=3+4x-2y+4+x-2-(2x-y+2)
z = 3+4x-2y+4+x-2-2x+y-2
z= 3x -y -1 ==> 3x-y-z =1 Letra A