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k in (-oo:+oo)
-6*k-3 = -39/7 // + -39/7
-6*k-(-39/7)-3 = 0
39/7-6*k-3 = 0
18/7-6*k = 0 // - 18/7
-6*k = -18/7 // : -6
k = -18/7/(-6)
k = 3/7
k = 3/7
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