I will help you with this. You can send me the equation in any legible format (as picture from a book, handwritten etc.) and I will deliver you with a graphic file (.png) which you can integrate into your document.
Don't hesitate to contact me before buying for special requests such as different output file formats, if you wish to get the LaTeX code for the equation instead or if you have exotic equations you want me to typeset.
2 long or 4 short equations
2 long (up to 1 page width) or 4 short (up to 1/2 page width) equations