Solve for k
k\in \left(-\infty,0\right)\cup \left(1,\infty\right)
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\frac{k+1}{2k}<1
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
-\frac{1}{2}\times \frac{1}{k}\left(k-1\right)<0
Factor out k.
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