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k in (-oo:+oo)
1/24-k = 2/5 // - 2/5
1/24-k-(2/5) = 0
1/24-k-2/5 = 0
-k-43/120 = 0 // + 43/120
-k = 43/120 // * -1
k = -43/120
k = -43/120
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