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k in (-oo:+oo)
(1/3)*k+8 = 239/30 // - 239/30
(1/3)*k-(239/30)+8 = 0
(1/3)*k-239/30+8 = 0
1/3*k+1/30 = 0 // - 1/30
1/3*k = -1/30 // : 1/3
k = -1/30/1/3
k = -1/10
k = -1/10
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