Ответ:

{ x/3 + y/2 = 5 ×6

{ 5x - 11y = 1

{2x+3y= 30

{5x-11y=1

2x+3y=30

2x= 30-3y

x= (30-3y)/2

5×(30-3y)/2-11y= 1 ×2

5×(30-3y)-22y= 2

150-15y-22y=2

-37y= -148

y= 4

x= (30-3×4)/2 = 9