Determine for the three vectors:

$x=ai+bj+ck,y=2i+k$ and $z=di+ej+fk$

where

$a=2,b=-2,c=5,d=4,e=7$

and $f=-1$

The value of $(xy).z.($ie the dot product of $z$ with the vector cross$-$product of $x$ and $y).$

Give your answer as an integer