The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using back-substitution.
A. {(10, -11, 3)}
B. {(25, -11, 3)}
C. {(27, -12, 3)}
D. ?
Answer: B
Mathematics
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A. 
B. 
C. 
D. 
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Simplify by removing grouping symbols and combining like terms.3a - {3b - 6[a - (b + 4a)]}
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