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A. solve the system of linear equations by using elementary row operation. x+5y+z=2, 2x+y-2z=1 and x+7y+2z=3 B. solve the following system of linear equation by

A. solve the system of linear equations by using elementary row operation.

x+5y+z=2, 2x+y-2z=1 and x+7y+2z=3

B. solve the following system of linear equation by using Gaussian elimination method.

x+3y+2z=2,2x+7y+7z= -1 and 2x+5y+2z=7

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