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a+b=-4
{a=6+b
{(6+b)+b=-4
{a=6+b
{6+b+b=-4
{a=6+b
{2b=-4-6
{a=6+b
{2b=-10 /:2
{a=6+b
{b=-5
{a=6+(-5)=1
{b=-5
sprawdzamy:
1-(-5)=1+5=6
1+(-5)=-4
odp: szukane liczby to 1 i -5
a-b=6
a+b=-4 dodajemy stronami
2a=2
a=1
b=-a-4
b=-1-4
b=-5
Szukane liczby to: 1 i -5