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k in (-oo:+oo)
-5*k-(2/7) = -127/77 // + -127/77
-5*k-(2/7)-(-127/77) = 0
127/77-5*k-2/7 = 0
15/11-5*k = 0 // - 15/11
-5*k = -15/11 // : -5
k = -15/11/(-5)
k = 3/11
k = 3/11
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