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k in (-oo:+oo)
(5/6)*k-7.5 = 7.5 // - 7.5
(5/6)*k-7.5-7.5 = 0
5/6*k-15 = 0 // + 15
5/6*k = 15 // : 5/6
k = 15/5/6
k = 18
k = 18
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