Solving the systems: 1) x-y+2z-w=-1 2x+y-2z-w=-2 -x+2y-4z+w=1 3x-3w=-3 2) v+3w-2x=0 2u+v-4w+3x=0 2u+3v+2w-x=0 -4u-3v+5w-4x=0 They have a solution?
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