1)/2х-5/=0 2)/4х-3/=0 3)/4-5х/=0 4)/4-5х/=0

2х - 5 = 0 2х = 5   х = 2,5 ---------------------- 4х - 3 = 0 4х = 3 х = 3/4 ------------------------- 4 - 5х = 0 - 5х = - 4     х = 4/5 -------------------------- 4 - 5х = 0 - 5х = - 4     х = 4/5