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k in (-oo:+oo)
-((4/7)*k)-5 = -59/7 // + -59/7
-((4/7)*k)-(-59/7)-5 = 0
(-4/7)*k+59/7-5 = 0
24/7-4/7*k = 0 // - 24/7
-4/7*k = -24/7 // : -4/7
k = -24/7/(-4/7)
k = 6
k = 6
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