online calculator for cramer's rule in linear algebra

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I am really bad at math because I don't spend a lot of time solving exercises but since I have to study cramer's rule in my class of linear algebra, I got really messy with all those number, so I thought in a way to solve it automatically because I was getting a lot of systems of linear equations for be solve, so I did a little software in c++ for solve this systems of 3*3, when I finished and as I had to do a web site for my school project I wrote the code in php and it worked really well, and I still working in improved the web site because I have realize that in some countries they solve it a little different even when they solve it using the cramer's rule, if you need to mess with cramer's rule you would check out it. www.algebrasolver.totalh.com