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