Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "s1"   was replaced by   "s^1".  1 more similar replacement(s).

Step  1  :

Equation at the end of step  1  :

  ((7x•(r4))•(s1))-((2•3xr3)•s)
 Step  2  :

Equation at the end of step  2  :

  (7xr4 • s) -  (2•3xr3s)

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   7xr⁴s - 6xr³s  =   xr³s • (7r - 6) 

Final result :

  xr3s • (7r - 6)