What is the value of x, when -25(x - 4) = -55(x - 10)? a) x = 5 b) x = -5 c) x = 81 8 d) x = 15

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.