Aryana simplified the expression 3(x + 4) + 2(2x – 3). she justified her work by letting x = 3 in both the given and simplified expressions. which is the correct simplified expression for aryana’s expression?

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.