How may I vertically left-align the word 'Similarly' with the word 'This' in the following?

    \documentclass[11pt,a4paper]{article}
    \usepackage{blindtext}
    \usepackage{mathtools}
    \usepackage{IEEEtrantools}

    \begin{document}
    \begin{equation*}
    (a+b)(a+b)=a^{2}+2ab+b^{2}.
    \end{equation*}
    This may of course be written
    \begin{flalign*}
    &&(a+b)^{2}&=a^{2}+2ab+b^{2}&\\
    \makebox[0pt]{Similarly}&&
    (a-b)^{2}&= a^{2}-2ab+b^{2}&\\
    \text{In the case}&&
    (a+b)(a-b)&= a^{2}-b^{2}
    \end{flalign*}
    \end{document}