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{2m=8-2n /+2n
{4m+2n=4 /*(-1)
{2m+2n=8
{-4m-2n= -4
{2m+2n=8
___________
-2m=4 /:(-2)
m= -2
{m= -2
{2m=8-2n
{m= -2
{2*(-2)=8-2n
{m= -2
{-4=8-2n /+2n
{m= -2
{2n-4=8 /+4
{m= -2
{2n=12 /:2
{m= -2
{n=6
SPRAWDZENIE:
* 4m=4-2n
4*(-2)=4-2*6
-8=4-12
-8= -8
* 2m=8-2n
2*(-2)=8-2*6
-4=8-12
-4= -4