∵|2x-4|+3|4y-6|=0
∴2x-4=0,4y-6=0
∴x=2,y=3/2
∴|x-y|
=|2-3/2|
=|1/2|
=1/2
-(x+y)
=-(2+3/2)
=-(7/2)
=-7/2