Solution - Linear equations with one unknown

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                     -4-(-(f-8))=0 

Step by step solution :

Step  1  :

Solving a Single Variable Equation :

 1.1      Solve  :    f-12 = 0 

 Add  12  to both sides of the equation : 
                      f = 12

One solution was found :