Ok the time for the first contest is here!
This is one that deals with basic Algebra, and is quite simple to
solve if one puts ones mind to it...

Below is an encoded message, use the inverse of the decoding matrix
to decode the message, then message me with the answer, and win
3 mending salves... Good luck

Decoding matrix:
1 -2
-1 3
coded message:
-16, 50, 4, -7, 11, -22, 1, -2, 7, -9, 7, -14

if you can decode the message, message me with the answer, the
first person who sends the correct answer, wins 3 mending salves.

-prizes subject to change without notice...

The Rahl

Penned by my hand on the 4th of Ero, in the year 233 AF.