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an=6-5v5 ,a1=v5 r=1-v5
6-5v5=v5+(n-1)(1-v5)
6-5v5=v5+n-v5n-1+v5
v5n-n=2v5-1-6+5v5
n(v5-1)=7v5-7
n=7v5-7 / v5-1 usuwam niewymierność pomnóżv5+1/v5+1
n=(7v5-7)(v5+1) /4
n=35+7v5-7v5-7 /4
n=28/4
n=7
odp n=7