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k in (-oo:+oo)
7-((1/2)*k) = -16 // + 16
7-((1/2)*k)+16 = 0
(-1/2)*k+7+16 = 0
23-1/2*k = 0 // - 23
-1/2*k = -23 // : -1/2
k = -23/(-1/2)
k = 46
k = 46
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