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0,12K+J=k
0,12K+47-K=K
47=2K-0,12K
47=1,88K
K=25
J=47-25=22
Kazimierz 25
Jan 22
y - ilość gołębi pana Kazimierza
x+y=47
x=y-12%y
x=y-0,12y
x=0,88y
0,88y+y=47
1,88y=47
y=25
x=0,88*25
x=22
odp: Pan Jan ma 22 gołębie a pan Kazimierz 25 gołębi.