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2x+1=liczba nr2
2x+3=liczba nr3
2x-1+2x+1+2x+3=39
6x+3=39
6x=36
x=6
Liczba nr1=2*6-1=12-1=11
Liczba nr2=2*6+1=12+1=13
Liczba nr3=2*6+3=12+3=15