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k in (-oo:+oo)
(1/2)*(4-k) = 0
1/2*(4-k) = 0
( 1/2 )
1/2 = 0
k belongs to the empty set
( 4-k )
4-k = 0 // - 4
-k = -4 // * -1
k = 4
k = 4
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