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k in (-oo:+oo)
1/4-k = 4*k+41/4 // - 4*k+41/4
1/4-k-(4*k)-(41/4) = 0
1/4-k-4*k-41/4 = 0
-5*k-10 = 0 // + 10
-5*k = 10 // : -5
k = 10/(-5)
k = -2
k = -2
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