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k in (-oo:+oo)
k/11 = 2/5 // - 2/5
k/11-(2/5) = 0
k/11-2/5 = 0
1/11*k-2/5 = 0 // + 2/5
1/11*k = 2/5 // : 1/11
k = 2/5/1/11
k = 22/5
k = 22/5
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