$$(3x+5)^2 = 0$$
Answer
$$ x = -\frac{ 5 }{ 3 } $$
Explanation
$$ \begin{aligned} (3x+5)^2 &= 0&& \text{simplify left side} \\[1 em]9x^2+30x+25 &= 0&& \\[1 em] \end{aligned} $$
$ 9x^{2}+30x+25 = 0 $ is a quadratic equation.
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