Balance the following reactions.

a. ____ CF₄ + ____ Br₂ → ____ CBr₄ + ____ F₂
b. ____ GaF₃ + ____ Cs → ____ CsF + ____ Ga
c. ____ MgF₂ + ____ Li2CO₃ → ____ MgCO₃ + ____ LiF
d. ____ Na₃PO₄ + ____ KOH → ____ NaOH + ____ K₃PO₄
e. ____ Al + ____ HCl → ____ H₂ + ____ AlCl₃

(a)

C is already balanced
F and Br just need one adjustment each; since 4=2*2,
CF4 + 2Br2 → CBr4 + 2F2

Now you try the others.
Come back with your attempts if you get stuck.