Question: Solve the equations 4x 1 + x 2 + x 3 = -1, -5x 1 + 4x 2 + 3x 3 = 4, x 1

Solve the equations 

4x1 + x2 + x3 = -1,    -5x1 + 4x2 + 3x3 = 4,    x1 - 2x2 + x3 = 2    

Using the matrix equation x = A-1 C.  

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