You can put this solution on YOUR website! you want to get these under a common denominator i presume.
multiply (3/(2a+5) by (7a)/7a)
multiply (4/7a) by (2a+5)/(2a+5)
you will get:
since the denominator is the same, you can now add these 2 fractions together to get:
simplify to get:
simplify further to get:
I believe that's as far as you can go with this.