Помогите очень надо 12+1целая 1/5х=20 1/2+х=3 1,4+1/5х=10

12 + 6/5х = 20; | • 5; 60 + 6х = 100; 6х = -60 + 100; 6х = 40; х = 40/6; х = 6 4/6; Х = 6 2/3. 1/2 + х = 3; х = 3 - 1/2; Х = 2 1/2. 1,4 + 1/5х = 10; |•10; 14 + 2х = 100; 2х = 100 - 14; 2х = 86; Х = 86 : 2; Х = 43