Solution - Simplification or other simple results

Step  1  :

             b
 Simplify   ——
            3b

Canceling Out :

 1.1    Canceling out b as it appears on both sides of the fraction line

Equation at the end of step  1  :

              1
  (5a + 7b) • —
              3

Step  2  :

Final result :

  5a + 7b
  ———————
     3