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2x-3y+4z-5t=2,2y-2z+14t=4,4x-5y+13z-3t=6,-3x+2y-8z-10t=-8
2x-3y+4z-5t=2,2y-2z+14t=4,4x-5y+13z-3t=6,-3x+2y-8z-10t=-8
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