Решите уравнения у-5/6=4/3; 2/5=6/х+3; 5/6=15/2х-3; 12:4/5х=20:1/4 /-дробная черта

У-5/6=4/3
у=5/6+4/3
у=5/6+8/6
у=13/6=2 целых 1/6

2/5 = 6/х + 3
6:х + 3 = 2/6
6:х = 2/6 - 3
6:х = - 2 4/6 = - 2 2/3
х = 6 : (-8/3)
х = - 18/8
х = - 2 1/4
5/6 = 15/2х - 3
15/2х - 3 = 5/6
15/2х = 3 + 5/6
15/2х = 3 5/6 = 23/6
х = 23/6 : 15/2
х = 23/45

12 : 4/5х = 20 : 1/4
12 : 4/5х = 5
4/5х = 12 : 5
4/5х = 12/5
х = 12/5 : 4/5
х = 3