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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
3J+5z-4=0 3x+y+5z-4=0 x-y+z-2=0 3x-7y+5z-4=0
(3-x)(3+x)=9-x2 -m2+n2=(m+n)(-m+n) (y+1)(y-3)=-(3-y)(y+1) 4yz-2y2z+z=2y(2z-yz)+z
(x+2y-3z)(x-2y-3z). (x-2y-3z)(x-2y+3z) (x+2y+3z)(x+2y-3z). (x+2y+3z)(x-2y-3z)
2x -y+2z =0 2x-y+2z=16 4x-3y+6z=42 4x-3y+6z=0
X.>Y.>Z Z.>Y.>X Z.>X.>Y Y.>X.>Z.
6x-3y+2z=31 4x-y+2z=31 6x-3y+2z=10 4x-y+2z=10
x+7y+4z+17=0 x+7y+4z-17=0 x-7y+4z+17=0 x+7y-4z+17=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
x-y+z=-2 x+y+z=2 x-2y+z=-3 x-y-z=0
4x+2y-z=0 4x-2y+z+3=0 16x+8y-16z+11=0 16x-8y+8z-1=0
2x-y+2z=0 2x-y+2z=16 4x-3y+6z=42 4x-3y+6z=0