$$9x^2 = 30x-25$$
Answer
$$ x = \frac{ 5 }{ 3 } $$
Explanation
$$ \begin{aligned} 9x^2 &= 30x-25&& \text{move all terms to the left hand side } \\[1 em]9x^2-30x+25 &= 0&& \\[1 em] \end{aligned} $$
$ 9x^{2}-30x+25 = 0 $ is a quadratic equation.
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