Type the left bracket that you want to appear around the equation number. From the top menu select Insert Object Create New. A highlighted area will appear along with equation editing palettes.
Its the first item on the list.
Click in the Middle Table Cell and then click Insert Click in the Symbols group. Equation Numbering in Word Documents Insert chapter section and equation numbers on either the right or left-hand side of your equations. Click in the Middle Table Cell and then click Insert Click in the Symbols group. Enter your equation in the second cell in the 3x1 table.