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k in (-oo:+oo)
60 = (5/8)*k // - (5/8)*k
60-((5/8)*k) = 0
(-5/8)*k+60 = 0
60-5/8*k = 0 // - 60
-5/8*k = -60 // : -5/8
k = -60/(-5/8)
k = 96
k = 96
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