Begin align vdots 127 int _ 0 2 left - frac 1 4 left e -4t _ 1 e 4t _ 1-8 right right dt _ 1 displaybreak 3 12- frac 7 4 int _ 0 2 left e -4t _ 1 e 4t _ 1-8 right dt _ 1 vdots end align. You get an equation number for every equation where you put a label. Usually I do this kind of work with latex but unfortunatly my editor only accept word document.
Select Insert Equation Save Selection to Equation Gallery.
Either number the AMSmath environments as LaTeX would or number all displayed equations the example above uses AMS-style numbering. Template for easy insertion of equations. Number the equations on the left. Change equation number latex.