$\displaystyle \frac{\displaystyle\frac{{\color{red}P^x}~\display style\frac{\Gamma}{(P\Rightarrow Q)}}{Q}~\displaystyle\frac{\Gamma}{(Q\Rightarrow R)}}{\displaystyle\frac{R}{(P\Rightarrow R)}~x}$

Is there any way to push down that $\displaystyle P^x$ so that it's sitting right on top of the line (while keeping everything else the same)?

Thanks.