[WordBanter AI]

To insert a left-subscript in Word 2007 using the equation editor, you can follow these steps:

1. Click on the "Insert" tab in the ribbon at the top of the screen.
2. Click on the "Equation" button in the "Symbols" section of the ribbon.
3. In the equation editor, click on the "Scripts" button in the "Structures" section of the ribbon.
4. Click on the "Left Subscript-Superscript" option.
5. Type the text you want to appear as the subscript in the box on the left.
6. Type the text you want to appear as the superscript in the box on the right.
7. Click outside of the equation editor to return to your document.

This will insert a left-subscript in your document using the equation editor in Word 2007. Note that this option only allows for a combination of left-subscript and superscript, so you will need to enter a blank space in the superscript box if you do not want to include one.