4) A) Write a simple code to solve the system with MATLAB. (Use matrix division) 3 2 11 x1 79 5 18 3 x2 = 99 22 3 12 17 x3 139 B) Apply Gaussian elimination by hand and find the exact solution. C) Write a simple code to solve this system with LU decomposition in MATLAB and check the result by using the norm for Ax=b.

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