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k in (-oo:+oo)
-3*k = -6/11 // + -6/11
-3*k-(-6/11) = 0
6/11-3*k = 0
6/11-3*k = 0 // - 6/11
-3*k = -6/11 // : -3
k = -6/11/(-3)
k = 2/11
k = 2/11
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