Page layout with LaTeX is a complicated matter. A cursory glance at the LaTeX documentation shows that the layout is determined by 11 different parameters. However, I find that the following commands are sufficient for most purposes:

\addtolength{\textwidth}{ain}
\addtolength{\hoffset}{-bin}
\addtolength{\textheight}{cin}
\addtolength{\voffset}{-cin}

If you want more control over your margins, then I highly recommend the LaTeX geometry package.

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