1. Solve by via Gauss-Jordan elimination:
a) 2y + 3z = 8
2x + 3y + z = 5
x − y − 2z = −5
b) x + 3y + 2z = 5
x − y + 3z = 3
3x + y + 8z = 10
c) 3x1 + x2 + x3 + 6x4 = 14
x1 − 2x2 + 5x3 − 5x4 = −7
4x1 + x2 + 2x3 + 7x4 = 17
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