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2i-a=4/k
(2/4)i-a=k
2i = a+ 4/k / *k
2ki = ak + 4
2ki - ak = 4
k(2i-a)=4 / :(2i-a)
k= 4/(2i-a)
2i= a+ 4/k | *k
2ki= ak+ 4
2ki-ak= 4
k(2i-a)=4 | :(2i-a)
k= 4/(2i-a)
|-obustronnie
pozdrawiam:)