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 :

                     21-(5-r)=0 

Step by step solution :

Step  1  :

Solving a Single Variable Equation :

 1.1      Solve  :    r+16 = 0 

 Subtract  16  from both sides of the equation : 
                      r = -16

One solution was found :