Solve for η (complex solution)
\eta =-\frac{\left(1-x\right)^{-\frac{3}{2}}\left(x-3\right)}{2}
x\neq 1
Solve for η
\eta =-\frac{x-3}{2\left(1-x\right)^{\frac{3}{2}}}
x<1
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