it's because people try as hardly as they can to make things the more complicate that it's possible for them.
It's something I see everywhere, even in math world.
example of complication 1 :
simple solution : the two equations are simmetric in x and y, so that it's clear that it must be x=y
the first equation becomes then : x^2 - x = 31 which is easily solved by the well known formula of the second order equation that even a 10 years old kid knows.
example of complication 2 :
simple solution : divide the second equation by the first. It will result c/a=2 or c=2a. Substitute c=2a in the third equation and you will get 2a^2 = 30 or a^2=15 which means that a
is equal to the square root of 15. Substitute it in the first equation and you get b, then substitute b in the second equation and you get c.
CONCLUSION : KEEP IT SIMPLE IF YOU WANT TO BE IN THE LITTLE 2% OF WINNING TRADERS.










