MATRIX ALGEBRA Find all solutions to the system of equations below, making use of the inverse matrix method. I1 + 12 + 313 + x4 = -4 -2r1 - 12-4r3 -4 = 4 21+4r2+ 10z3 + 2r4 = -20 -2r1 – 4r3 + 5x4 = 9

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