Question: I am taking notes in LaTeX for sometime now. But I'm stuck with this one now. I want to create the equation below in LaTeX.
[![A picture of the equation I want to recreate](https://i.stack.imgur.com/rPbbx.png)](https://i.stack.imgur.com/rPbbx.png)

I tried using `\underbrace` `\Centerstack` command but I don't know how to create arrows like above. And the text color isn't much important. This is all I was able to achieve.

[![This is all I could achieve ](https://i.stack.imgur.com/c8GVO.png)](https://i.stack.imgur.com/c8GVO.png)

Edit: Here is my code.

```
\documentclass{article}

\usepackage{stackengine}
\usepackage{mathtools} 

\begin{document} 

\Centerstack{FCFF} = \text{NOPLAT} + \underbrace{\Centerstack{Non-cash Operating Expenses} - \Centerstack{Investment in Invested   Capital}}_{\text{Net Investment}}

\end{document} 

```

As you can see, text alignment isn't much that good too.

I think you can understand what I want to achieve. Thank you.

Answer: 
Not pretty code, but the formula isn't pretty, too. 

```
\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
\textup{FCFF}+
\textup{NOPLAT}+
{\underbrace{%
  \begin{tabular}{@{}c@{}} Non-cash \\ Operating Expenses \end{tabular}%
  \;-\;
  \overset{\substack{\textup{Gross Investment\smash[t]{\strut}}\\\big\downarrow}}{%
    \begin{tabular}{@{}c@{}} Investments in \\ Invested Capitals \end{tabular}%
  }
}_{\textup{Not Investment}}}
\]

\end{document}

```

[![enter image description here](https://i.stack.imgur.com/gCUjC.png)](https://i.stack.imgur.com/gCUjC.png)

I added `\smash[t]{\strut}` to add some vertical space above the down arrow; also some space around the minus sign to make it more visible.
```
\documentclass[fleqn]{article}
\usepackage{amsmath}
\begin{document}
\[\text{FCFF}+\text{NOPLAT}
=\underbrace{\begin{tabular}{@{}c@{}}
Non-cash\\
operating expenses\end{tabular}
-\overset{\begin{array}{@{}c@{}}\text{Gross investment}\\
\downarrow
\end{array}}{\begin{tabular}{@{}c@{}}
Investment in\\
invested capital\end{tabular}}}_{\text{Net Investment}}
\]
\end{document}

```

[![enter image description here](https://i.stack.imgur.com/E12Cs.png)](https://i.stack.imgur.com/E12Cs.png)