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