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k in (-oo:+oo)
-16 = (1/2)*k-7 // - (1/2)*k-7
7-((1/2)*k)-16 = 0
(-1/2)*k-16+7 = 0
-1/2*k-9 = 0 // + 9
-1/2*k = 9 // : -1/2
k = 9/(-1/2)
k = -18
k = -18
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