A.Z Challenge 24: X is unknown

This is the equation, 

ax+b=c,

and x is the unknown. Find x; that's easy,

x=(c-b)/a.

Now, let's put in some real numbers, a=2, b=6, c=14, or a=II, b=VI, c=XIV. The answer is x=4 or x=IV, in Arabic and Roman numbers, respectively. Which do you prefer? Today we use the Hindu-Arabic number system, because it's logical and makes it easier  to perform calculations.

There are a few exceptions, in names of popes and kings, and for making the production year unreadable in Hollywood movies.

It wasn't always like that. In earlier times, the Pope's clers did the bookkeeping in Roman numbers. The change from Roman to Arabic numbers did not happen without controversy in the Catholic part of the world.

It was argued that Arabic numbers made it easier to perform fraud. Just add a zero at the end to turn 100 into 1000. Also, it made the clers less exclusive. With Arabic numbers, anyone could do math, at least simple calculations, without being trained on the abacus.

Then there's the religious part. The Arabic numbers came from the Muslim world, the Christian's enemies who conquered the Holy Land. Some Christian scholars even claimed that the Arabic number system was an act of Satan.

In Satan we trust, at least when doing math. >:)

There's an alternative saying regarding math; God made the integers, the rest is Man's work.

Appendix: 

Many years ago I read a cool book called "Number Theory and It's History" (by Øystein Ore). That’s were I learnt most of the stuff above. I also learnt that there's a simple logical reason for our base-10 number system. Many cultures developed their number systems based on the number of fingers on one hand (African tribes), on two hands (modern system), or the total number of fingers and toes  (Mayas). 

The exception is the Babylonians who used base-60. That's why we have 60 minutes in an hour. 60 was a magic number. It's the only number that divide into all the integers from 1 to 6. Also, the Babylonians, who didn't know about Pi, discovered that 6 equal-sided triangles with 60 degree angles fit into a circle. That's why we still count 360 degrees around the full circle.