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2a+2b = 16
6a = 5b
wiec:
2a=5/3b
5/3b+2b = 16
2a=5/3b
11/3b = 16
b = 48/11 => b = 4 i 4/11
2a = 5/3b => 2a=80/11 => a=40/11 => a= 3 i 7/11
6a = 5b
b = 4 4/11
a= 3 7/11