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k in (-oo:+oo)
-((2/7)*k)-8 = -632/77 // + -632/77
-((2/7)*k)-(-632/77)-8 = 0
(-2/7)*k+632/77-8 = 0
16/77-2/7*k = 0 // - 16/77
-2/7*k = -16/77 // : -2/7
k = -16/77/(-2/7)
k = 8/11
k = 8/11
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