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k in (-oo:+oo)
(-2/9)*k = 6/7 // - 6/7
(-2/9)*k-(6/7) = 0
(-2/9)*k-6/7 = 0
-2/9*k-6/7 = 0 // + 6/7
-2/9*k = 6/7 // : -2/9
k = 6/7/(-2/9)
k = -27/7
k = -27/7
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