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