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{6x+6y=186 |:6
{6x+5,4y=178,8
{x+y=31
{6(31-y)+5,4y=178,8
{x=31-y
{186-6y+5,4y=178,8
{x=31-y
{-6y+5,4y=178,8-186
{x=31-y
{-0,6y=-7,2 |:(-0,6)
{x=31-y
{y=12
{x=31-12
{y=12
{x=19
{6(x+y)=180+6
{6x+5,4y=178,8
{6x+6y=186 / ×(-1)
{6x+5,4y=178,8
{-6x-6y=-186
------------------
6x+5,4y-6x-6y=178,8-186
5,4y-6y=-7,2
-0,6y=-7,2 / ÷(-0,6)
y=12
6x+6×12=186
6x+72=186
6x=186-72
6x=114 / ÷6
x=19
{x=19
{y=12