$$x^2+17x+49 = 3x$$
Answer
$$ x = -7 $$
Explanation
$$ \begin{aligned} x^2+17x+49 &= 3x&& \text{move all terms to the left hand side } \\[1 em]x^2+17x+49-3x &= 0&& \text{simplify left side} \\[1 em]x^2+14x+49 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+14x+49 = 0 $ is a quadratic equation.
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