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d*2=k/2*2 (to sie skroci) *1/a +1/b | *b
d*2*b= k*1/a + 1/b *b (to sie skroci)
d*2*b =k*1/a +1 | :k+1
d*2*b/k+1= k*1/a +1 / k+1 skroc k i 1
d*2*b/ k+1 = 1/a | *1
d*2*b/k+1*1=a