Question

w+x+y+z=6, 2w+2x-2y-2z=4, 7w-2x+2y+z=24, w-x+3y+7z=4

w+x+y+z=6, 2w+2x-2y-2z=4, 7w-2x+2y+z=24, w-x+3y+7z=4

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