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*x-7*(x+20)-(85)=0 

Step by step solution :

Step  1  :

Equation at the end of step  1  :

  (4x -  7 • (x + 20)) -  85  = 0 

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   -3x - 225  =   -3 • (x + 75) 

Equation at the end of step  3  :

  -3 • (x + 75)  = 0 

Step  4  :

Equations which are never true :

 4.1      Solve :    -3   =  0

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

Solving a Single Variable Equation :

 4.2      Solve  :    x+75 = 0 

 Subtract  75  from both sides of the equation : 
                      x = -75

One solution was found :