Solve by Gaussian elimination:
a) x + y − z = 1, 2x + y + z = 5, 2x + y = 0
b) x + 2y + z = 4, 2x − y + Z = 4, x − y + 2z = 0
c) y + 2z = 2, x + y − z = 3, 2x + z = 4
d) 2x + y + 3z = 6, 2x + y + 5z = 8, − 2x + 3y − 4z = −3
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