Gaussian Elimination Help



How do you solve for the x's (variables) using backward substitution in gaussian elimination?

  [ 1.0  - 0.75        - 1.0                0.25                 9.25         ]
  [                                                                           ]
  [ 0.0   1.0    - 0.15384615384615  - 0.076923076923077   0.23076923076923   ]
  [                                                                           ]
  [ 0.0   0.0           1.0           0.90990990990991     4.063063063063063  ]
  [                                                                           ]
  [ 0.0   0.0           0.0                  1.0          - 27.00787401574803 ]

This is my final matrix. How can i solve the x's?

Thanks for your help.

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