k in(-oo:+oo)
8*k=4/9 / / - 4/98*k-(4/9) = 0
8*k- 4/9 =0
8*k-4/9 = 0 / / 4/9
8*k= 4/9 / / :8
k = 4/9/8
k =1/18
k=1/18
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