book Maths Puzzle Numerical Ability

can you please help me with my problem. its about System of Linear Equations in three variables,


A Dependent system of three equations:
2x - 3y - z = 4 (1)
-6x + 9y + 3z = -12 (2)
4x - 6y - 2z = 8 (3)


please help..

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