How to adjust 3 Dell U2412M to show similar colors?

I just got 3 Dell U2412M monitors. Unfortunately, all 3 of them reproduce colors differently. I do not need them to be perfectly calibrated I just want them to reproduce fairly similar colors. I am not a gamer nor a photograph. I am just an ordinary user who wants to have 3 screens.

White on one of screens is brighter and colder with a blueish tint.

White on the second one has a slight yellow tint.

White the third is a bit darker than the second screen and it has a slight grey tint.

I have lowered brightness to 35 (which most users seem use) on all 3 and the rest of the settings are set to factory default. What settings should try to adjust to match colors for all 3 screens?

I have no color calibration experience and I am unfamiliar with most settings.

I made a similar thread, I would like to know how to do this aswell.

You won't get any where near a satisfactory result without using hardware, i.e a Colorimeter.