Respuesta :

7x + 3y = -9 
      +9      +9 
________________

7x + 3y + 9 = 0 
      -3y            -3y
_______________

7x + 9 = -3y 
(divide each side by negative 3) 

7x        9
__   +   __     =  y
-3           -3     

simplified it would be :

7x
__    - 3 = y 
-3

the correct answer is -3
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