It would have a variable, and/or coefficients and sometimes constants
 
        
             
        
        
        
Answer:
There are 25 students in the class.
Step-by-step explanation:
Since we know the percentage of students who want an ice cream party is 20%, and 5 students want an ice cream party, we know that:

, where S is the total amount of students. We can then solve for S:
 Given equation
 Given equation
 Multiply by S
 Multiply by S
 Divide by 0.2
 Divide by 0.2
Therefore, there are 25 students in the class.
 
        
                    
             
        
        
        
If you expand the square, you have

Simplify the right hand side:

Cancel the -3x appearing on both sides:

Multiply both sides by 4:

Consider the square root of both terms (using the doubles sign):

 
        
             
        
        
        
From my thinking don’t use this one because I’m not really answering 5-2=3=3