Solve 4x + 3 = 19 
Reason: 
4x + 3  3 = 19  3 
The objective is to find x. First remove + 3 from the left. Subtract 3 from both sides. 
4x = 16 
Calculate the left. Calculate the right. 

Next remove the 4 in front of the x from the left. Divide both sides by 4. 
x = 4 
Calculate the left. Calculate the right. 