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k in (-oo:+oo)
1/20 = (2*k)/5 // - (2*k)/5
1/20-((2*k)/5) = 0
(-2/5)*k+1/20 = 0
1/20-2/5*k = 0 // - 1/20
-2/5*k = -1/20 // : -2/5
k = -1/20/(-2/5)
k = 1/8
k = 1/8
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