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k in (-oo:+oo)
64/99 = (8/9)*k // - (8/9)*k
64/99-((8/9)*k) = 0
(-8/9)*k+64/99 = 0
64/99-8/9*k = 0 // - 64/99
-8/9*k = -64/99 // : -8/9
k = -64/99/(-8/9)
k = 8/11
k = 8/11
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