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k in (-oo:+oo)
(1/4)*(k-1)^7 = 0
1/4*(k-1)^7 = 0
( 1/4 )
1/4 = 0
k belongs to the empty set
( k-1 )
k-1 = 0 // + 1
k = 1
k in { 1, 1, 1, 1, 1, 1, 1 }
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