Question 42078
The first and the last equations are same.
So you have only 2 equations and 3 unknowns to solve.
2 equations are not sufficient to determine uniquely 3 unknowns.
so the system of equations is inconsistent.


Further, the determinant
|-1 -4 -1|
|-2  2 -6| 
|-1 -4 -1|
is zero as its first and third rows are identical.
So Crammer's rule is not applicable and there is no solution.