The diagram shows a parallelogram EFGHEFGHEFGH. The top side EF EF\,EF has a length of 8x−128x - 128x−12. The bottom side HG HG\,HG has a length of 5x+35x + 35x+3. All measurements are in centimetres.

The perpendicular height of the parallelogram is 4 cm.
Find the area of EFGHEFGHEFGH.