4. Solve the linear system of equations below via matrices showing your work in detail. X1 + X2 - Хз + 3 Х4 %3D 1 X2 X3 4 x4 = 0 X1 + 2 x2 2 x3 - X4 = 6 4x1 + 7 х2 — 7хз = 9

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