Combine like terms. 5x+4t+7+12x-4+4t+3x

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.

If you answer 2+2 you will get over 80 points

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out