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For the following system to be consistent, \[ \begin{aligned} 3 x+5 y+4 z & =-6 \\ 13 x+19 y+k z & ...
For the following system to be consistent, \[ \begin{aligned} 3 x+5 y+4 z & =-6 \\ 13 x+19 y+k z & =33 \\ 4 x+6 y+2 z & =8 \end{aligned} \] we must have, \( k \neq \)