x + y + z = 3 , x = 1/2 , y = 1 , z = ?, -1/2, 1/2, -3/2, 3/2, x + 2y + 3z = 10 , y = 1 , z = 2 , x = ?, 0, 1, 2, 3, 2x + 2y + 2z = 18 , 2x + y + z = 12 , x + 2y + z = 11 , x = ?, -1, 1, 2, 3, 2x + y - z = 7 , 3x + 2y - z = 12 , 5x + 3y + z = 22 , z = ?, 1, 2, 3, 4, 2x + 2y + 2z = 16 , 2x + 3y + 2z = 20 , 2x + 2y + 3z = 20 , x + y + z = ?, 4, 6, 8, 12.

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