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k in (-oo:+oo)
-2*k = -14/11 // + -14/11
-2*k-(-14/11) = 0
14/11-2*k = 0
14/11-2*k = 0 // - 14/11
-2*k = -14/11 // : -2
k = -14/11/(-2)
k = 7/11
k = 7/11
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