Could you re-post your equations? There are two equations with three unknowns and the '+' signs didn't appear, if there were any.
I'm guessing it's a +2y and +3z
Here, double equation 1, to get
Or conversely you could halve equation 2.
Then you have:
Wait... here I find that both equations are the exact same... You can't solve a simultaneous eauation if both of them are the same.