9/14 x - 1/7 x - 0,5 x =
9/14 x - 2/14 x - 0,5 x =
7/14 x - 0,5 x =

9/14х - 1/7х - 0,5х = 0            0,5х = 5/10х = 1/2х 

1) 9/14х - 1/7х - 1/2х  =  9/14х - 2/14х - 7/14х = 0