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k in (-oo:+oo)
15 = 10-((1/2)*k) // - 10-((1/2)*k)
(1/2)*k-10+15 = 0
1/2*k+5 = 0 // - 5
1/2*k = -5 // : 1/2
k = -5/1/2
k = -10
k = -10
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