If you have Word 2003 or earlier, you use Insert > Object and choose
Microsoft Equation 3.0. However, that isn't installed by default. If you
don't see "Microsoft Equation 3.0" in the list at Insert > Object, then use
Add/Remove programs and customize the installation to include the Equation
Editor.
Word 2007 has an entirely new Equation Editor and it is installed by
default. Use Insert > Equation.
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