Yeah when i first got it, it had way too much pressure. Its all set now
Too much air pressure will wear the center of the tread
Too little air pressure will wear the both outer edges of the tire
Excessive wear on one side of the tire is a camber problem inside wear too much camber, outside edge too little camber (wear in the rear indicates a possible bent housing)
If the wear is unequal from one side to the other and has a feathered edge on each row of the tread a toe problem is indicated (if the feathered edge is towards the outside of each tread it has too much toe out and vise versa)
As the complete left rear tire is not visible, nor is the right tire clearly shown and you have just acquired the car so the history of the tires is unknown, you need to check some other things other than air pressure.
Is the axle housing square with the direction of travel? Note I did not say square with the frame because it may not be square. If it is not square with the direction of travel the outside tread on one tire and the inside read of the other will be worn, There may also be some slight feathering of the tread which will be on the opposite on each tire.
After you are sure that the rear end is square to the direction of travel and the housing is not bent you will need to square the front axle to the rear axle, that is make the wheel base the same on both sides. Then set caster the same on both sides of the front axle. Finally set the front axle toe. Mabe Ted can supply the caster and toe settings.
Now it is possible that your steering wheel is not centered and this can be fixed by adjusting the steering arm.
Or if you are not comfortable with these settings locate a good alignment shop, one that has experience with your type of suspension. There are times when having a professional do the work is money well spent.
Al