$$x^2+11x+29 = x+4$$
Answer
$$ x = -5 $$
Explanation
$$ \begin{aligned} x^2+11x+29 &= x+4&& \text{move all terms to the left hand side } \\[1 em]x^2+11x+29-x-4 &= 0&& \text{simplify left side} \\[1 em]x^2+10x+25 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+10x+25 = 0 $ is a quadratic equation.
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