According to the first formula 3x+z=23.
By the second formula x+y-y/y=9
By the third formula z+yz=24
This equation group has two sets of solutions.
x= 12,y=-2,z=- 13
Or x=6, y=4 and z=5.
Then x+y+z = -3 or x+y+z = 15.