How do you solve the equation 63.9x7. 0

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

Don't know how to find x given these segment lengths

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.