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2x+4y-z=0 2x+2y-3z=0 2x+y-Z=0 x+2y-3z=0
2x-y+2z=0 2x-y+2z=16 4x-3y+6z=42 4x-3y+6z=0
y-z=0 y+z=0 4x+y+z=0 2x+2y-z=0
2x+4y-z+1=0 2x+2y-3z-7=0 2x-6y+2z-7=0 2x+ 6y-2z+7=0
-3x+4y-6z=0 -2x+3y-z=0 14x+9y-z-15=0 -5x+7y-7z=0
3J+5z-4=0 3x+y+5z-4=0 x-y+z-2=0 3x-7y+5z-4=0
2x -y+2z =0 2x-y+2z=16 4x-3y+6z=42 4x-3y+6z=0
x-20y+7z=12 x+20y+7z=12 x+20y-7z=12 x-20y-7z=12
2x+4y-z+1=0 2x+2y-3z-7=0 2x-6y+2z-7=0 2x+6y-2z+7=0
x+y+z+2=0 x-y+z+2=0 x+y-z+2=0 x+y+z-2=0
2x+y﹣z+2=0 2x+y+z﹣6=0 2x+y+z﹣4=0 2x+y﹣z﹣3=0
2x+4y-z=0 2x+2y-3z=0 2x+y-z=0 x+2y-3z=0
2x+8y+z+8=0 2x-8y+z+8=0 2x+8y-z+8=0 2x+8y+z-8=0
2x-y+2z=0 2x-y+2z=16 4x-3y+6z=42 4x-3y+6z=0