5x-3y+z,-4x+z,-3x+5y+2z
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2x −2y +z =−3. 21) 4x − 3y + 2z = 40. 5x + 9y − 7z = 47. 9x+8y −3z =97. 2) 2x + 3y = z − 1. 3x =8z − 1. 5y +7z =−1. 4) x+ y + z =2. 6x − 4y +5z = 31. 5x+2y +2z = 13.
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