"Solution: Given 1: -x - 5y - 5z = 2.......(1)
line 2: 4x - 5y + 4z = 19.........(2)
line 3: x + 5y - z = -20..........(3)
solving (1),(2) and (3)
we get x=-2
y=-3
z=3
line 1: -x - 5y + z = 17 ….....(1)
line 2: -5x - 5y + 5z = 5.........(2)
line 3: 2x + 5y - 3z = -10 …......(3)
solving (1),(2) and (3)
we get x=-1
y=-4
z-4"