Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "0.7" was replaced by "(7/10)".

Step  1  :

             7
 Simplify   ——
            10

Equation at the end of step  1  :

         7
  0 -  (—— • t)
        10

Step  2  :

Final result :

  -7t
  ———
  10