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k in (-oo:+oo)
k+k+4/4-(1/4) = k+(4/4)*k // - k+(4/4)*k
k+k-k-((4/4)*k)+4/4-(1/4) = 0
k+k-k-k+4/4-1/4 = 0
3/4 = 0
k belongs to the empty set
k belongs to the empty set
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