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k in (-oo:+oo)
3/5-((1/2)*k) = 1/10 // - 1/10
3/5-((1/2)*k)-(1/10) = 0
(-1/2)*k+3/5-1/10 = 0
1/2-1/2*k = 0 // - 1/2
-1/2*k = -1/2 // : -1/2
k = -1/2/(-1/2)
k = 1
k = 1
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