Answer:
add 18 to both sides, giving you 3x = 96
 
        
             
        
        
        
Answer:
3 bob's burger= 23.67
2 starry night= 17.98
4 clear= 42
Step-by-step explanation:
3 x 7.89= 23.67
2 x 8.99= 17.98
4 x 10.50= 42
 
        
             
        
        
        
For any equation,

assume solution of a form, 
Which leads to,

Simplify to,

Then find solutions,

For non repeated real root y, we have a form of,

Following up,
For two non repeated complex roots  where,
 where,

and,
 
 
the general solution has a form of,

Or in this case,

Now we just refine and get,

Hope this helps.
r3t40
 
        
             
        
        
        
Answer:
12* ( 4+5)
Step-by-step explanation:
48 = 12 * 4
60 = 12 * 5
48 + 60 = 12*4 + 12*5
              = 12*( 4 + 5)
             = 12* 9
             = 108