An "equation editor" is a tool or software that helps you create and edit mathematical equations on a computer. It allows you to type complicated math symbols, formulas, and equations easily, just like you would write them on paper. Full definition
Design Science develops software used by educators, scientists and publishing professionals, including MathType, Equation Editor in Microsoft Office, MathFlow, MathDaisy and MathPlayer, to communicate on the web and in print. (respondus.com)
However you can edit these as you wish through a word processor (for division questions, Word will work best with the Microsoft Equation Editor plugin). (tes.com)
If the animations get mixed up I apologise but for some reason Equation Editor doesn't have square brackets onto which one can put limits! (tes.com)