Question 1163693
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(1) The format of the equation is very poor; I can only guess what the equation really is.  If I were to guess, it looks to me like x-4+x+3=x^2-x-12: {{{x-4+x+3=x^2-x-12}}}<br>
But I'm not going to spend any time on your question when I don't KNOW what the equation is.<br>
(2) The question itself doesn't make any sense.  Most equations have certain solution(s); I don't know what to make of the question "what values of x cannot be solutions" to the equation.<br>