Question: Solving linear equations

Hi, can anyone help me with this questions? Thanks!

 

Use maple to find the general solution to the following system of linear equations:

2x1  + x2 - x3 +3x4 = 2

x1 + 2x2 -x4 = -1

3x1 +2x2 -2x3 +x4 = 1

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