X=100
Explanation- 
180=57+x+23
180=80+x
180-80=x
100=x
        
             
        
        
        
7x+3(4x-8)=109
7x+12x-24=109
19x-24=109
19x=109+24
19x=133
X=133÷19
X=7
 
        
             
        
        
        
Answer:
24
Step-by-step explanation:
you would multiply 3 tables by 4 students, that would be twelve. then 12 times 2, which is 24. Or you could find the pencils by multiplying 2 with 8 and then multiplying by 3. :)
 
        
                    
             
        
        
        
Answer:
ok
Step-by-step explanation: