How can I have two motors on my X-axis?

Hi, I am currently working on a project that requires only movement in two axes, X and Y.
I am stuck at this point as I have tried to configure MARLIN to be able to use two motors on the X axis, however, I have been unsuccessful.
Another important feature of the project is that it will not have an extruder or bed.
I have RepRapDiscount Smart Controller, DRV8825, RepRap Pololu 1.4 and arduino Mega, could someone help me?

There is a whole section dedicated of this Forum dedicated to Marlin, why didn't you ask there?

Presuming your wanting two stepper motors on two separate stepper drivers
If it a newer version you simply define

#define X_DRIVER_TYPE A4988
#define X2_DRIVER_TYPE A4988

With your driver type

That is it

Marlin will reallocate an unused Extruder as X2
Or if you want more control than that you have to edit the boards pin.h file

I really got confused, I thought it was in that forum, sorry.