{ 2 (x + y) = 40 /:2
{ x = 6 + y
2(x+y) = 40 /:2
x = 6+y
x+y = 20
x-y = 6
----------- +
2x = 26 /:2
x = 13
=====
y = 20-x
x = 13
y = 20-13 = 7
y = 7
====
{x = 13}
{y = 7 }
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{2(x+y)=40 /;2
{x=6+y
{x+y=20
{x=6+y
{6+y+y=20
{x=6+y
{2y=20-6
{x=6+y
{2y=14 /:2
{x=6+y
{y=7
{x=6+7=13