Solution - Simplification or other simple results

Step  1  :

            j
 Simplify   —
            r

Equation at the end of step  1  :

   j        j
  (— • a) • —
   c        r

Step  2  :

            j
 Simplify   —
            c

Equation at the end of step  2  :

   j        j
  (— • a) • —
   c        r

Step  3  :

Multiplying exponential expressions :

 3.1    j¹ multiplied by j¹ = j^{(1 + 1)} = j²

Final result :

  j2a
  ———
  cr