How do u find partial pressure from a balanced equation

Partial pressure can be calculated from balanced equation as :  

Partial pressure can be calculated from total pressure and mole fraction of a molecule. The equation of partial pressure is given as:  

Mole fraction can be calculated from number of moles of different substances, that we can get from a balanced equation.  

If a balanced equation is as follows:  

aA+bB---->cP  

Mole fraction of A will be =  

And partial pressure of A will be:

can you list the answers so i can answer