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k in (-oo:+oo)
-10 = (5/9)*k // - (5/9)*k
-((5/9)*k)-10 = 0
(-5/9)*k-10 = 0
-5/9*k-10 = 0 // + 10
-5/9*k = 10 // : -5/9
k = 10/(-5/9)
k = -18
k = -18
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