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k in (-oo:+oo)
k*(((100*k-5)^1)/5) = 0
k*((100*k-5)/5) = 0
(k*(100*k-5))/5 = 0
( 100*k-5 )
100*k-5 = 0 // + 5
100*k = 5 // : 100
k = 5/100
k = 1/20
( k )
k = 0
k in { 1/20, 0 }
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