[Tex/LaTex] twoside page, outside border on right side smaller than on the left

double-sidedmargins

I have to hand in my thesis tomorrow and it's not working. I want to print it like a book (print front and rear of a page). That's why I am using twopages. But the outside border is different for the right and the left page.
My code 

 \documentclass[a4paper,twoside,12pt]{article}
 \usepackage[utf8]{inputenc} 
 \usepackage{fontenc}
 \usepackage[hcentering,bindingoffset=9mm]{geometry}
 \setlength{\oddsidemargin}{0.5cm}
 \setlength{\textwidth}{15,5cm}
 \setlength{\textheight}{23cm}

What do I have to change that the outside border of the riht and left page are the same size (and the inside border too)?
Thank you soooooooooooooooooo much!!!!!

Best Answer

I'm not sure to understand.

If you want odd and even pages to have the same margins, you can call geometry with the option asymmetric.

For example

\documentclass[a4paper,twoside,12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{fontenc}
\usepackage[asymmetric]{geometry}
\usepackage{blindtext}

\begin{document}
\blinddocument
\end{document}

enter image description here

If you also want right and left margins to have the same width, that is to have the same look of a one-sided document, you have to add the option hcentering (but in this case I wouldn't understand why using twoside).

For example

\documentclass[a4paper,twoside,12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{fontenc}
\usepackage[asymmetric,hcentering]{geometry}
\usepackage{blindtext}

\begin{document}
\blinddocument
\end{document}

enter image description here

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