Solve for x.

5x = 4 +x

2/3x = 1/2

3x - 2x + 4 = 15/3

4x + 7 = 2x + 17

.5x = 10

1.  5(x) - [4 + x] = ? 
      4(x - 1)
       4 = ?
          x - 1 = ? 
           Now let's add ( + ) to your sides 
                        x = 1 

2.   = ? 
     
      = ? 
     
    L denominator = 3
    R denominator = 2
   Put them together it would be 6 
    = ? 
   4(x) - 3 = ? 
  Let's add 3 from your sides 
 Repeat the process but let's divide by 4 
  4(x) = 3 
 Answer   x = 

3. 3(x) - 2(x) + 4 -  = ? 
   
   x + 4 - 5 = ? 
  x - 1  = 0
 Now, let add the number 1 from each sides 
  x = 1 

4.  4(x) + 7 - 2(x) +  17 = ? 
    2(x - 5)
    2 = ?
    x - 5 = 0
   Replace the subtraction symbol and make it a addition symbol ( but by 5)
  x = 5 

5.    .5(x) - 10 = ? 
       
        = ?
       
       
        x - 20 =  0 
Add the number 20 to each of your sides after replacing the subtraction symbol to a addition symbol 
    x = 20 

The answer is 109 times per second