-3 ??? x ???? +13y+29z=81
and what do you want? A solution using Gauss Jordan ? If so go to:
http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
Which is equivalent to
14x-3y+2z=100
-17x+8y+10z=11
-3+13y+29z=81
3 answers
14x-3y+2z=100
-17x+8y+10z=11
-3x+13y+29z=81
-17x+8y+10z=11
-3x+13y+29z=81
x = -7717/335
y = -36738/335
z= 16662/335
y = -36738/335
z= 16662/335