Respuesta :

diagonals of a rect. are equal...
diagonals bisect each each other...
from these two properties we get ,

4x-12 = 1/2 (7x-18)

2 (4x-12)=7x-18

8x-24=7x-18

x=6


HOPE IT HELPS YOU '_'

Answer:

x = 6

Step-by-step explanation: