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k in (-oo:+oo)
(3/5)*(15*k-20) = 0
3/5*(15*k-20) = 0
( 15*k-20 )
15*k-20 = 0 // + 20
15*k = 20 // : 15
k = 20/15
k = 4/3
( 3/5 )
3/5 = 0
k belongs to the empty set
k = 4/3
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