TeX source:

\begin{aligned} \text { Brazil's GDP in \$ U.S. } & =\frac{\text { Brazil's GDP in reals }}{\text { Exchange rate (reals } / \$ \text { U.S.) }} \\ & =\frac{7.4 \text { trillion reals }}{2.362 \text { reals per } \$ \text { U.S. }} \\ & =\$ 3.1 \text { trillion } \end{aligned}