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The addition of bromine would cause the equilibrium to shift towards the reactant's side.
When a reaction is in equilibrium and one of the constraints that affect the rate of reactions is applied, the equilibrium shifts so as to annul the effects of the introduced constraints.
Thus, for the reaction
NaBr(s) ⇌ Na+(aq) + Br−(aq)
The addition of HBr would introduce more Br- into the reaction. Consequently, the equilibrium will shift to produce more NaBr so as to annul the effects of the addition of Br-
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