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x=y podzielic przez 1/4 wiec y pomnozyc przez odwrotnosc wiec x=4y
k=1/4 n
k podzielic przez 1/4 =n
n=4k
y=2t-1
y+1=2t | :2
(y+1)/2=t
R=abc/4P | *4P
R*4P=abc / :R
4P=abc/R |:4
P=(abc/R)/4