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k in (-oo:+oo)
(-5/6)*k-6 = -31/6 // + -31/6
(-5/6)*k-(-31/6)-6 = 0
(-5/6)*k+31/6-6 = 0
-5/6*k-5/6 = 0 // + 5/6
-5/6*k = 5/6 // : -5/6
k = 5/6/(-5/6)
k = -1
k = -1
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