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k in (-oo:+oo)
1 = (k^1)/4 // - (k^1)/4
1-((k^1)/4) = 0
1-(k/4) = 0
1-1/4*k = 0 // - 1
-1/4*k = -1 // : -1/4
k = -1/(-1/4)
k = 4
k = 4
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