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k in (-oo:+oo)
(k^2-(8*k))/17 = 0
(k^2-8*k)/17 = 0
k^2-8*k = 0
k*(k-8) = 0
k-8 = 0 // + 8
k = 8
k*(k-8) = 0
(k*(k-8))/17 = 0
( k-8 )
k-8 = 0 // + 8
k = 8
( k )
k = 0
k in { 8, 0 }
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