$$(8x+6)^2 = 0$$
Answer
$$ x = -\frac{ 3 }{ 4 } $$
Explanation
$$ \begin{aligned} (8x+6)^2 &= 0&& \text{simplify left side} \\[1 em]64x^2+96x+36 &= 0&& \\[1 em] \end{aligned} $$
$ 64x^{2}+96x+36 = 0 $ is a quadratic equation.
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