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{a/b= ³/₂ to sie mnoży a z 2 b z 3
{a+3b=27
{2a=3b
{a+3b=27
{2a-3b=0
``````````
__3a=27/:3
___a=9
a+3b=27
9+3b=27
3b=27-9
3b=18/:3
b=6
{a=9
{b=6
a/b= 3/2
a=27-3b
(27-3b)2=3b
a=27-3b
54-6b=3b
a=27-3b
-9b=-54
a=27-3b
b=6
a=27-3*6
b=6
a=27-18
b=6
a=9
b=6