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k in (-oo:+oo)
(-6/(-5))*k = 15 // - 15
(-6/(-5))*k-15 = 0
6/5*k-15 = 0 // + 15
6/5*k = 15 // : 6/5
k = 15/6/5
k = 25/2
k = 25/2
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