Answer
The equilibrium will shift to the right, producing more $Br_2$ and $F_2$, while consuming more $BrF_5$
Work Step by Step
Lower pressure at constant temperature: Greater volume.
With a greater volume, the equilibrium will shift in the direction that has the greater amount of moles.
Reactants: 2
Products: 6
Therefore, the equilibrium will shift to the right, producing more $Br_2$ and $F_2$, while consuming more $BrF_5$.
