In word, the formula is centered and the number is right aligned.

From: http://blog.sina.com.cn/s/blog_57e48d0b0100bgke.html has a small change.

1. First, display the ruler. Normally, it can be seen in the upper part of the word interface.

2. The cursor stops at the row where the formula is located. The specific position in the row is not required.

3. Select the tab format on the left side of the ruler. (This is like this)

3.1 select the center tab and click the left mouse button in the middle of the ruler to display a center tab. You can drag a tab to any position.

3.2 select the right alignment tab and click the left mouse button at the end of the ruler to display a right alignment tab. You can drag a tab to any position.

Note: The order of 3.1 and 3.2 is different. You can also drag any tab to the specified position, and then set the tab attribute. These two attributes determine the position of the formula or number relative to the cursor. The former is set to center, and the latter is set to right-aligned.

The positions of the two tabs determine the positions of the formulas and numbers in the row. When you need to modify the positions, drag the two tabs.

4. Add a tab (click the tab key) before the formula, and then add a TAB between the formula and the number.

5. Success!