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