The answer is A because the x has different numbers
        
             
        
        
        
X= 12 + y
So then plug in
12 + y + y = 12
2y=0
Y= 0
X + 0 = 12
X= 12
this is prob wrong lol but hopefully it helps
        
             
        
        
        
Solve the equation:
          5              3
x  –  ——  =  –  ——
          7              7
           5
Add  ——  to both sides, so you get  x  isolated at the left-hand side:
           7
          5          5               3          5
x  –  ——  +  ——  =  –  ——  +  ——
          7           7              7           7
              3          5
x  =  –  ——  +  ——
              7           7
Now, add those fractions at the right-hand side of the equation:
          – 3 + 5
x  =  —————
               7
          2
x  =  ——     <———    this is the answer (first option:  2/7).
          7
I hope this helps. =)
        
             
        
        
        
The difference between 2x+16=14 than 2x+16=x+14 is that you would have to solve x in two different ways like finding the first equation another way than to the second equation ( I think ).