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a + b = 16
a - b = 5
------------------ +
2a = 21 /:2
a = 10,5
b = 16 - 10,5
b = 5,5
{a = 10,5
{b = 5,5
a-b=5
a+b=16
a-b=5
---------
2a=21/:2
a=21/2
a=10,5
a+b=16
10,5+b=16
b=16-10,5
b=5,5
a=10,5
b=5,5