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k in (-oo:+oo)
-5*k-(1/2) = 3*k+15/2 // - 3*k+15/2
-5*k-(3*k)-(1/2)-(15/2) = 0
-5*k-3*k-1/2-15/2 = 0
-8*k-8 = 0 // + 8
-8*k = 8 // : -8
k = 8/(-8)
k = -1
k = -1
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