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Solve x(2)-x(3)= -9 2x(1)-x(2)+4x(3...

Solve
`x_(2)-x_(3)= -9`
`2x_(1)-x_(2)+4x_(3)=29`
`x_(1)+x_(2)-3x_(3)= -20`
by reducing the augmented matrix of the system to reduced row echelon form.

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