Show the factorization and solve. x 1 - x 2 + 3x 3 + 2x 4 =
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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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