{THIS ANSWER IS WRONG, PLEASE READ MY SECOND ANSWER} You first multiply both sides by (x+1) and you get x+3=x2+x. You then subtract x from both sides and you get 3=x2 which is \(\sqrt{3}\)=x.
sorry, I read the problem wrong the first time, the real answer is x≤−√3 or −1 < x ≤ √3