in Exercises 11-16, solve the system by Gaussian elimination. (See Example 4.) 12. 2x - y - z = 15 11. x+y-z= 4 3x + 2y + 42 = 17 -x+ 5y + z = 8 4x + 5y + 22 = 10 -x- 4y + 3z = -20

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