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 :

                     12*a-(21)=0 

Step by step solution :

Step  1  :

Pulling out like terms :

 1.1     Pull out like factors :

   12a - 21  =   3 • (4a - 7) 

Equation at the end of step  1  :

Step  2  :

Equations which are never true :

 2.1      Solve :    3   =  0

This equation has no solution.
A a non-zero constant never equals zero.

Solving a Single Variable Equation :

 2.2      Solve  :    4a-7 = 0 

 Add  7  to both sides of the equation : 
                      4a = 7
Divide both sides of the equation by 4:
                     a = 7/4 = 1.750

One solution was found :