I am trying to recreate this image
The text in the right box is 3 lines and it gets weird. I tried increasing text width option. However its not that nice option and left box also gets huge which I don't want.
Please help me create this (almost) image.
\documentclass[border=10pt,tikz]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{trees,positioning,shapes,shadows,arrows}
\begin{document}
\tikzset{
basic/.style = {draw, text width=2cm, drop shadow, font=\sffamily, rectangle},
root/.style = {basic, rounded corners=2pt, thin, align=center, fill=white},
level-2/.style = {basic, rounded corners=3pt, thin,align=left, fill=white, text width=7cm},
level-3/.style = {basic, thin, align=center, fill=white, text width=1.8cm}
}
\begin{tikzpicture}[
level 1/.style={sibling distance=30em, level distance=5em},
% {edge from parent fork down},
edge from parent/.style={->,solid,black,thick,sloped,draw},
edge from parent path={(\tikzparentnode.south) -- (\tikzchildnode.north)},
>=latex, node distance=1.2cm, edge from parent fork down]
\node[root] (A) at (0,2) {$AX=0$};
\draw[->] (A) to (0,.3);
\node[root] {\textbf{Always consistent}}
child {node[level-2] (c1) {\textbf{rank $A=n$} \\ \textbf{Unique Solution $X=0$}}}
child {node[level-2] (c1) {\textbf{rank $A<n$} \\ \textbf{Infinitely many Solutions \\ $n-r$ arbitrary parameters in solution}}}
;
\end{tikzpicture}
\end{document}