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k in (-oo:+oo)
(3/5)*k+15 = (8/5)*k // - (8/5)*k
(3/5)*k-((8/5)*k)+15 = 0
(3/5)*k+(-8/5)*k+15 = 0
15-k = 0 // - 15
-k = -15 // * -1
k = 15
k = 15
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