HELP SOON NEEDED!! I will give out 70 points to anyone who answers this! Please help I’ve been stuck for more than 5 hours.

Find the value of x in the diagram below. select the best answer from the choices provided

Can someone show me step by step how to do this?

The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.