Solve the system using Gaussian elimination. 5x - 7y + 7z = -86-25x + 35y - 35z = 430 15x - 21y + 21z = -258
A. {(x, y, z) 
5x - 7y + 7z = -86}
B. {(-6, 2, -6)}
C. {(x, y, z) 
15x - 21y + 21z = -86}
D. ?
Answer: A
Mathematics
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