||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
x, y, z = var('x,y,z')
eq1 = 2*x - 13*y +3*z == 4
eq2 = -6*x + 39*y - 9*z ==  -12
eq3 = 0

solve([eq1, eq2, eq3], x,y,z)}}}

/* code_ends */

 * '''Solution by''': 
  * ganesh, developer, space
  * bhanukiran, student, technical university of Delft
  * saransh, student, sobhit university