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k in (-oo:+oo)
k+1/3 = (2/5)*k+1/3 // - (2/5)*k+1/3
k-((2/5)*k)+1/3-(1/3) = 0
k+(-2/5)*k+1/3-1/3 = 0
3/5*k = 0 // : 3/5
k = 0
k = 0
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