$$2xx-32x+128 = 0$$
Answer
$$ x = 8 $$
Explanation
$$ \begin{aligned} 2xx-32x+128 &= 0&& \text{simplify left side} \\[1 em]2\cdot1x^2-32x+128 &= 0&& \\[1 em]2x^2-32x+128 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}-32x+128 = 0 $ is a quadratic equation.
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