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

/* code_begins */

{{{
x, y, z = var('x,y,z')
eq1 = 2*x + 3*y - 7*z == 3
eq2 = x - 4*y + z == 0
eq3 = -14*x - 21*y +49*z == -20

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

/* code_ends */

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