How can I edit docx file on my mac book?

HI, I AM TRYING TO EDIT A DOCUMENT SENT TO ME FROM A NON APPLE PC AND SAVED IN DOCX FORMAT. WHEN I OPEN IN PAGES THE FORMATTING IS ALL OVER THE PLACE AND HALF OF THE TEXT IS MISSING FROM IT. I'VE TRIED GETTING THEM TO SEND AS DOC FILE BUT STILL SAME ISSUES. I REALLY DONT WANT TO PUT MS OFFICE ON MY MAC IF POSSIBLE.....HELP PLEASE!!