The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered triple, if possible.
A. (7, -5, z) 
B. (7 - 6z, -5 + 2z, z) 
C. (7 - z, -5 + z, z) 
D. (7 + 6z, -5 - 2z, z) 
Answer: B
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, 
, 
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A. < B. > C. =