Rearranging algebraic formula- make a the subject of the formula.

p=3a+5/4-a. 1.Times both side by (4-a) in order to remove the denominator. p(4-a)=3a+5. 2. Expand the brackets. 4p-ap=3a+5 3.Now you need to get the two a's on the same side. doesn't matter if you plus the ap or minus the 3a, but generally easier to work in positives if you can. 4p-5=3a+ap. 4.Now factorise the right hand side by the common factor (a). 4p-5=a(3+p). 5.In order to get a on its own divide both sides by (3+p) leaving you with your answer 4p-5/3+p=a