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k in (-oo:+oo)
12 = (7/8)*k // - (7/8)*k
12-((7/8)*k) = 0
(-7/8)*k+12 = 0
12-7/8*k = 0 // - 12
-7/8*k = -12 // : -7/8
k = -12/(-7/8)
k = 96/7
k = 96/7
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