Question 524070
u + v + w + x + y + z = 0
2u - v + 3w + 4x - 7y -z = 39 
-u +v + 4w -x -y -z = 0
8u -3v + 5w -3x - 3y + 3z = 69
4u - 4v + 3w - 5x - y + z = 39
2u - v - w + x - 7y -2z = 23
u + v - w + x - y + z = 8