TeX source:
\begin{aligned}&15,000 \cdot\left(\frac{1+.09}{12}\right)^{60}=\frac{\mathrm{x}\left[\left(\frac{1+0.09}{12}\right)^{60}-1\right]}{\frac{0.09}{12}} \\&15,000 \cdot 1.5657=\mathrm{x} \cdot 75.4241 \\&311.38=\mathrm{x}\end{aligned}