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k in (-oo:+oo)
7-((1/8)*k) = 32 // - 32
7-((1/8)*k)-32 = 0
(-1/8)*k-32+7 = 0
-1/8*k-25 = 0 // + 25
-1/8*k = 25 // : -1/8
k = 25/(-1/8)
k = -200
k = -200
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