4p+5-7p=-1

4p + 5 - 7p = -1

First combine the variable terms:

 

(4p - 7p) + 5 = -1

-3p + 5 = -1

 

Then subtract 5 from both sides to isolate the variable:

 

-3p = -6

 

Now divide both sides by -3 to get p:

 

p = -6/-3

 

p = 2