Question 1207383
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The value  x = -3  is  PROXIBITED  for this equation, 
since the fractions in both sides of this equations are not defined at  x = -3.


As people say in  Math,  the value  x = -3  is not in the domain of this equation,
while we are looking for the solutions that  ARE  in the domain.


When we get the solution  x = -3,  we get it for  ANOTHER,  transformed equation,

and this value does not work for the original equation.


The original equation and the transformed equation are NOT equivalent.



This is a complete explanation, in few words.   Full and complete.