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x + y/2 is equal to

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in Matrices & determinants by (35 points)

If the system of equations

x + y + 3z = 0

x + 3y + k2z = 0

3x + y+ 3z =0

has a non-zero solution (x,y,z) for some    k € R , then x + y/2 is equal to 

related to an answer for: If the system of equations x + y + z = 2 2x + 4y – z = 6 3x + 2y + λz = µ has infinitely many solutions, then :
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