1/2 * (4 - 3 1/2х) = 1 1/4х - 1/2
4/2 - 7/2х * 1/2 = 5/4х - 1/2
-7/4х - 5/4х = -1/2 - 4/2
-12/4х = -5/2
-3х = -2,5
х = -2,5 : (-3)
х = - 25/10 * (-1/3)
х = 25/30 = 5/6
1/2 * (4 - 3 1/2х) = 1 1/4х - 1/2
4/2 - 7/2х * 1/2 = 5/4х - 1/2
-7/4х - 5/4х = -1/2 - 4/2
-12/4х = -5/2
-3х = -2,5
х = -2,5 : (-3)
х = - 25/10 * (-1/3)
х = 25/30 = 5/6