Question

Dado el sistema:
5xy=12(x+y)
5yz=18(y+z)
13xz=36(x+z)
Hallar x+y+z

Answer 1

x=(5xy-12y)/12
y=(5yz-18y)/18
z=(13xz-36y)/36
x+y+z=
(15xy-36y+10yz-36z+13xz-36x)/36