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