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k in (-oo:+oo)
(3/5)*k = 9.06 // - 9.06
(3/5)*k-9.06 = 0
3/5*k-9.06 = 0 // + 9.06
3/5*k = 9.06 // : 3/5
k = 9.06/3/5
k = 15.1
k = 15.1
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