The diagram shows a parallelogram WXYZWXYZWXYZ. The top side WX WX\,WX has a length of 5x−75x - 75x−7. The bottom side ZY ZY\,ZY has a length of 2x+142x + 142x+14. All measurements are in centimetres.

The perpendicular height of the parallelogram is 9 cm.
Find the area of WXYZWXYZWXYZ.