Răspuns:xy-3x+2y-6=9
xy-3x+2y=15
x(y-3)+2y=15
x(y-3)=15-2y
x=15-2y/y-3
x=5-2
x=3=>3y-3*3+2y-6=9
3y-9+2y-6=9
5y-15=9
5y=24
y=24/5