Samba

All compounds are zero. Al is in group III (or 13 depending onh the system used) so the oxidation state is 3. You have 12 O at -2 each for -24. That leaves -24+3 = -21. So 3 Cl atoms must be +21 to balance the -21 there which makes +21/3 or +7 for each Cl...

P has a positive charge. It's fine I got it. Still, the answer hasn't been posted yet.