In Exercises, find the general solution to the indicated system of linear equations. You may use ref, and the backslash operation (A\b) if it applies.
4. –19x1 – 128x2 + 81x3 + 38x4 = 3
8x1+ 61x2 – 27x3 – 16x4 = 5
2x1+ 4x2 + 12x3 – 4x4 = –21
–8x1– 16x2 + 12x3 + 16x4 = –4
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