9.8 Given the equations 10x, + 2x, - X3 = 27 -3x - 6x2 + 2x3 = -61.5 X1 + X2 + 5x3 = -21.5 (a) Solve by naive Gauss elimination. Show all steps of the com- putation. (b) Substitute your results into the original equations to check your answers.

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