Question: Show the factorization and solve. x 1 - x 2 + 3x 3 + 2x 4 = 15 -x 1 + 5x 2 - 5x

Show the factorization and solve.

  x1    - x2  + 3x3    +  2x4 =  15
-x1 + 5x2   - 5x3    -   2x4 = -35
3x1 - 5x2 + 19x3  +   3x4 = 94
2x1 - 2x2 +  3x3   + 21x4 =   1

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