\[
\boxed{
 \left\{ {\frac {\rm d}{{\rm d}t}}x \left( t \right) =6\,x \left( t \right) -72\,y \left( t \right) +44\,z \left( t \right) ,{\frac {\rm d}{{\rm d}t}}y \left( t \right) =4\,x \left( t \right) -4\,y \left( t \right) +26\,z \left( t \right) ,{\frac {\rm d}{{\rm d}t}}z \left( t \right) =6\,x \left( t \right) -63\,y \left( t \right) +38\,z \left( t \right)  \right\} }
\]