Đặt x-1/2=y-2/3=z-3/4=K=)) x=2k+1
y=3k+2
z=4k+3
=))x-1-y-2+z-3/2-3+4=2k+1-3k+2+4k+3/2-3+4
=3k+2=10
=))3k=12
=))k=4
Vậy 2k+1=4=))x=9
3k+2=4=))y=14
4k+3=4=))z=19
Khi đó:x+y+z=9+14+19=42