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