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 :

                     q-21-(21)=0 

Step by step solution :

Step  1  :

Solving a Single Variable Equation :

 1.1      Solve  :    q-42 = 0 

 Add  42  to both sides of the equation : 
                      q = 42

One solution was found :