Nilai x pada gambr tersebt..

[Perbandingan]

AC / BC = EC / DC
  (4 + 5) / 5 = (5x - 2 + 4x + 2) / (4x + 2)
           9 / 5 = (9x) / (4x + 2)
9 . (4x + 2) = (9x) . 5 
    36x + 18 = 45
            36x = 45 - 18
            36x = 27
                x = 27 / 36
                x = 3 / 4

ab/ed = bc/dc
4/(5x-2) = 5/(4x+2)
5 x (5x-2) = 4 x (4x+2)
16x + 8 = 25x -10
-9x= -18
x= 2