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k in (-oo:+oo)
3*k-(5*k)-(6/10) = 0
3*k-5*k-3/5 = 0
-2*k-3/5 = 0 // + 3/5
-2*k = 3/5 // : -2
k = 3/5/(-2)
k = -3/10
k = -3/10
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