X1 + 2х2 — Хз — 2х4 — 2 a) Find the solution set of the linear system:{2x1 + x2 – 2x3 + 2x4 = 1. (x1 + 2x2 + 3x3 + 2x4 = 6 2 1 -- 2 2 2 b) Let A = Evaluate |A|. 1 2 3 - - 2.

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