3x +2y +5y-3x = 8+6
8x = 14
x = 14/8
x= 7/4
2y=8-3x
2y= 8-3*7/4
2y = (31-21)/4
8y = 10
y= 10/8
y= 5/4
{ x/2 - y/3 = 14
{ x = 54 - 3/2y
{ 54 - 3/2y/2 - y/3 = 14
y = 12
x = 54 - 3/2 * 12
x = 36
{ 36/2 - 12/3 = 14
{ 36/18 + 12/12 = 3
{ 14 = 14
{ 3 = 3
(x, y) = (36, 12)
1. Делим левую и правую часть на 2
2. Умножаем на k левую и правую часть