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k in (-oo:+oo)
(-5/6)*k-8 = -1/2 // + -1/2
(-5/6)*k-(-1/2)-8 = 0
(-5/6)*k+1/2-8 = 0
-5/6*k-15/2 = 0 // + 15/2
-5/6*k = 15/2 // : -5/6
k = 15/2/(-5/6)
k = -9
k = -9
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