Order the expressions from least value to greatest value please help

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

This is so hard and it’s for a test

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.